in the video clip, why is the blind man puzzled?
when ezra pound says that “great literature is simply language charged with meaning to the utmost possible degree,” he probably means that _____.
what is probably not true of mary, the main character in “early autumn”?
when we say that the first paragraph foreshadows the body of the short story, we mean that it_____.
the words on the cardboard “i’m blind, please help” do not seem to draw much attention because _____.
ezra pound has made another comment that literature is “news that stays news.” this probably means _____.
which of the following adjectives can probably best describe bill’s attitude?
which of the following statements about the author-narrator relationship is true?
in a short story the role of the narrator is of vital importance because _____.
what description does not suit frank sargeson as a writer?
the language of the short story has all the following characteristics except one. which is the exception?
which one of the following statements describes an “implied author”?
which statement about the “naïve narrator” is not generally accepted?
which one of the following characteristics is not a proper description of “a piece of yellow soap.”
the two levels of understandings, the surface level and the deep level, are made more manifest by the author’s use of a naïve narrator. what advantage does this way of narration have?
which of the following examples about hero or an anti-hero is not true?
what is probably untrue of miss brill and her fur piece?
which of the following statements does not give a correct description of miss brill?
which of the following statements about character types is not true?
which statement about mansfield’s connection with xu zhimo is not true?
which of the following adjectives could not be used to describe miss brills’ feelings when, at last, she decides to put the fur back in its box?
miss brill goes to the park regularly. why?
which of the following could not be one of the dimensions of setting: _____.
selzer’s short stories about the sick and diseased have introduced a new way of writing called ______, which is the writing by medical professionals, who share humanity in their professional experiences.
by whom is the story narrated?
what description of the hospital ward is true?
the term “setting” and “background” are both translated into chinese as “背景”. which is a more proper definition about “setting”?
“the discus thrower” was first published in 1979 in______, a collection of short stories.
in the short conversation, we hear the patient’s demand for shoes. why does he still want his shoes since he has no legs?
how does the setting of the story make you feel?
which of the following statements about “story” as a literary term is not true?
the most striking feature of regional stories is______.
what is probably untrue of sylvia and her life?
which of the following statements about conflicts in the story is not true?
which of the following statements about “plot” as a literary term is not true?
which of the following statements does not give a correct description of the man in the short story?
the story reaches its climax when ______.
generally speaking, irony has the following functions except ______.
which of the following facts is not true about kate chopin's life?
which of the following statement is not true about “the story of an hour”?
which of the following statement is not relevant to the themes of “the story of an hour”?
a math teacher forgot simple addition. this is an example of ______.
in 1899, chopin published her second novel, _____. it is her most famous novel.
what do the views, the scents and the sounds outside the open window symbolize?
mrs. mallard's reaction to her huand's death is an example of _____ .
which of the following statements about “metaphor” and “symbol” is not true?
which of the following works is not written by joyce?
which adjective is not a proper description of the style of the short story “araby”?
which of the following statements about the symboli of darkness is not true?
symbol functions well in a literary work because it could ______.
which adjective is not a proper description of the life in north richmond street?
why does the boy want to go to the bazaar, or the “araby,” so desperately?
which of the following statements is not true?
if you think that “the lady, or the tiger” is a piece of work typically romantic in its characteristics, which of the following descriptions is not relevant?
which of the following statements is not true of the king?
stockton spent his childhood in an age when tall tale was the most popular genre of american literature. a tall tale is _____.
romantic literature has all the following features except one. which is the exception?
which of the following statements about “the lady, or the tiger” is true?
in the short story the king is a man of conflicting nature. what does the character represent?
which of the following statements is a more reasonable comment on the story?
which one of the four statements is not an accurate description about literary reali as a movement?
what do you think is the main function of a realistic writer?
there are five main characters in the short story “guests of the nation.” which is the correct situation?
the first-person narrator in “guests of the nation” tells the story _____.
reali is often seen as a reaction against romantici. what is not a typical characteristic of literary romantici?
when hugh holman says: “realistic writers usually have a powerful interest in the audience,” he probably means _____.
which description is closest to the narrator in “guests of the nation”?
the argument over the "next world" reveals that hawkins and noble .
the literary term “naturali” is mainly concerned with______.
which of the following statements is not true about jack london’s life?
which of the following statements is not true about the plot of “the law of life”?
the following statements all testify to the philosophy of naturali in the story except one. which is the exception?
which of the following statements is not true about naturali?
what is an important source of inspiration for jack london’s writings?
what does “the law of life” in this short story imply?
the naturalist idea of “nature is not kindly to the flesh” is shown through the following ideas except______.
which of the following adjectives best describes walter mitty’s real life?
the narrative of the story ______.
which of the following statements about the short story is not true?
wwi had greatly shaken the faith of european and american writers in western civilization. which might not be one of their doubts?
which of the following adjectives is not a suitable description of walter mitty’s wife?
which of the following adjectives can probably best describe mitty in his daydreams?
the short story is a narration in which reality and fantasy interweave. what does this way of presentation suggest?
which of the following statements about postmoderni is not true?
which of the following statements is not true about donald barthelme?
the following post-war developments in literature are collectively described as being postmodern except______.
donald barthelme’s best-known work is ______.
the story reveals a lot about the reality of the time. which of the following statements is probably not true?
which of the following statements is true about the technique of parody used in “the glass mountain”?
which statement about “defamiliarization” as a literary term is not true?
which of the following statements is not characteristic of a short story?
mary doesn’t say anything when she gets on the bus. why?
the title of the short story “early autumn” may give a hint to the reader that ______.
which is a more acceptable statement about a short story?
the short story “a piece of yellow soap” is told by _____.
when sargeson’s stories are compared to “swarming wasps that disturb the world by their little humming and painful stings,” “the world” here most likely refers to _____.
in “a piece of yellow soap,” the author’s manipulative use of the narrator _____.
which of the following quotations is “showing” instead of “telling”?
which of the following quotes from “miss brill” could not serve as an example of “stream of consciousness”?
“but as miss brill wondered, the ermine toque turned, raised her hand as though she'd seen someone else, much nicer, just over there, and pattered away.” this sentence about the woman wearing an ermine toque shows that_____.
miss brill does not stop at the bakery for a slice of honey cake as she usually does, because _____.
which statement about “theme” as a literary term is true?
which of the following statements is not a proper description of “the discus thrower”?
read the story carefully and make a list of contrasts that you find. which of the following is probably not one of them?
which of the following might not be one of the possible thematic implications of the author when he describes the patient’s throwing the plates?
which of the following statements about traditional plot pattern is not true?
which of the following descriptions of jewett’s identity is not true?
how does sylvia’s feel when the man mentions the white heron for the first time?
why does sylvia decide not to share the secret of the white heron with the man?
which of the following statements is true about women’s position in america by the end of the 19th century?
mrs. mallard is most probably killed by _____.
the doctor’s claim that mrs. mallard dies of joy is an example of dramatic irony because ______.
the followings are all “private symbols” except one. which is the exception?
which of the following statements about joyce’s writing is not true?
what do you think the theme of the story is?
which of the following statements about the symboli of araby is not true?
which statement about american romantici is not true?
much of the story of “the lady, or the tiger” lies in _______.
stockton made the question “the lady or the tiger?” a probe into ______.
people often compare reali to a mirror. but this mirror ogy neglects _____.
the realistic tradition _____.
which of the following conflicts is not implied as the theme of the short story?
which of the following is not the characteristic of naturali?
jack london’s naturalistic philosophy is formulated by all the following factors except______.
finally, old koskoosh said to himself, “was it not the law of life?”what do these words reveal to us?
which statement about “stream of consciousness” as a literary term is not true?
what sort of “the secret life” of walter mitty do the “courtroom trial” and the “execution by a firing squared” episodes reveal to us?
the story starts with a mitty’s daydream and ends with another. this structure tells the reader something about the character. which is probably not indicated?
mitty is an anti-hero, an alienated inidual _____ in a predominantly urban world.
which of the following is not the characteristic of postmoderni?
which of the following statements is not true about “the glass mountain”?
which of the following statements is probably not the reason that the narrator decides to throw the beautiful princess down to the street?
this short story has all the following characteristics of a postmodern writing except one. which is the exception?
用户窗口中能够放置的图形对象不包括:
嵌入式组态软件建立的工程可以直接在计算机上模拟运行。
实时数据库主要起到公共数据交换区的作用。
窗口名称建立后不可以更改。
组态环境和运行环境不能同时运行。
绘图工具箱中几何元件中不包括以下:
按钮元件的按下操作功能中不包括:
元件的位置可以移动,大小不能改变。
按钮元件使用时,按下和弹起时的文本内容可以不同。
mcgs组态工程中的数据类型不包括:
变量a=30,b=20,则表达式 a and b 的值是:
“great"是一个合法的变量名称。
"$date“是一个合法的变量名称。
变量的名称是大小写敏感的,也就是区分大小写。
本项目中所使用的变量的数据类型是数值型。
本项目中按钮的操作为按下时按1松0.
按钮元件按下文本和弹起文本的一致性受“使用相同属性”选项控制。
项目工程可以下载到tpc中,脱离计算机独立运行。
绘图工具箱中,以下哪一个不是常见的几何图形元件:
按钮的操作属性中,按下功能中的数据对象值操作不包括:
mcgs嵌入版软件中,下面哪一个不是常用数据类型:
实时数据库的作用是:
本项目中,用梯形工具表示手电筒灯光,需要在动画连接中选中:
以下哪张选项卡不在工作台中:
以下关于控制按钮文本的说法,错误的是:
数值型变量的值不可能是下面哪个:
开关型变量的值中,表示开的是:
关于用户窗口,说确的是:
1.拉伸构件的强度条件σ≤[σ]中,σ是( )应力;[σ]是( )应力。
σ的大小取决于( )和( ),与( )无关。
[σ]的大小取决于( ),与( )无关。
对于圆柱挤压面,挤压面的面积是( )。
举出两个最常见的剪切变形工程构件的名称( )和( )。
精馏塔塔板过薄可能发生()破坏,内压容器一般发生()破坏, 外压容器发生 ( )。 a.强度 b.刚度c. 稳定性
单向拉伸时,构件内应力是(),内压容器内是(),外压容器内是()。 a.三向应力 b.二向应力状态 c.单向应力状态
圆筒形压力容器中一定存在的应力有()()和()。 a.经向薄膜向应力 b.环向薄膜应力 c.径向弯曲应力 d. 环向弯曲应力 e. 二次应力
凸型封头不包括()(),中低压容器最常用的凸型封头是()。 a.锥形封头 b.球形封头 c.椭球形封头 d.蝶形封头 e.平板封头
理论上承受压力的最小厚度是(),真正承受介质压强的厚度是(),最终标注在图纸上的厚度是()。 a.最小厚度 b.理论计算厚度 c.设计厚度 d. 有效厚度 e. 名义厚度
圆柱壳体的第一曲率半径为(),第二曲率半径为(),球壳的第二曲率半径为()。 a.∝ b. r c.d
焊接接头系数φ是一个()的参数,它的数值决定于()和()。 a.≤ 1 b.<1 c.焊接接头结构 d.焊条的强度 e. 无损检验的比例 f.焊缝型式
圆平板承受均布载荷时,周边简支的最大应力()周边固支,()的最大应力出现在周边,()的最大应力出现在板的中心。 a. 大于 b. 小于 c. 周边简支 e.周边固支
弹性模量e的大小表示的是材料( ),它影响构件的构件的( )和( )。 a. 弹性 b. 抵抗弹性变形能力 c.强度 d.刚度 e.稳定性
内压圆筒体上经向薄膜应力作用在环向截面上,环向薄膜应力作用在( )上,其中环向应力是(), 经向薄膜应力是()。 a. 横截面 b. 纵截面 c. 第一主应力 d. 第二主应力
外压容器的设计,筒体和封头的稳定系数均为3。
法兰选用过程中,存在法兰、螺栓、螺母和垫片的匹配问题。
对所有没有明显屈服的材料,都规定了名义屈服极限σ0.2。
第一强度理论适用于脆性材料,第四和第三强度理论适用于塑性材料。
内压圆筒内部的经向薄膜应力等于环向应力的两倍。
结构尺寸相同的条件下,高强度低合金钢制备的外压容器承压能力一般高于碳素钢的。
中碳钢强度高,比低碳钢更适合制造压力容器。
冲击实验的目是测量该温度下的冲击功,从而了解材料对缺口的敏感程度。
封头的外压设计都是将其转换成球形的外压设计。
压力容器的受压元件包括筒体、封头、法兰以及支座等。
对各种基本变形产生的内力的求解采用 。
材料在一定条件下会发生蠕变,蠕变的条件为一定的 和一定的 。
设计温度是在相应设计压力下设定的温度,其值不得 容器工作时器壁金属可能达到的 温度;若器壁金属在0℃以下,则设定的设计温度不能 器壁金属可能达到的 温度。
20和45号钢相比,强度 ,硬度 (高或低), 塑性 ,可焊性 (好或差)。
圆筒的计算长度大于临界长度,被称为__________. 失稳时横截面将呈__________ 个波形;圆简的计算长度小于临界长度,被称为_________ , 失稳时横截面将呈__________波 形。
化工设备上通用零部件标准的最基本参数是( )和( )
为了评价开孔处应力集中的影响,将开孔应力集中情况的主要影响因素归纳为一个系数,称为( )。
中低压容器最常见补强结构是( )。
若精馏塔塔板过薄,可能发生()破坏。
下列面粉中哪种成分的存在不利于焙烤食品的保存,在制粉时要尽量除去。
在制作烘焙食品时,我们所加入的糖只是为了给食品提供甜味。
做面包时配方中油脂量高,可使面包表皮
焙烤食品中常用的化学疏松剂有nahco3、nh4hco3。
蛋白不易打发的原因很多,下列何者并非其因素
在制作面包时,为了使成品面包体积更大,我们可以不加入食盐。
下列面粉哪种成分含量越高反而会使面粉的吸水量降低?
下列哪种因素不会影响到面粉的熟化?
下列哪种糖的成分与其他三种不一样?
制作海绵蛋糕时,油脂的 ( ) 越好,油脂小粒子分布会更均匀,得到的蛋糕也越大。
在制作酥性饼干时,选用下列那种油脂,会使制品口感疏松?
下列哪种疏松剂可以不作处理,直接与面粉混合?
油脂与面筋的结合可以 ( ) 面筋,使制品内部组织均匀,口感改善。
在下列选项中,哪一种糖熔点较低,常用作焙烤食品的着色剂?
蛋黄在焙烤食品加工工艺中主要是起 ( ) 作用。
小苏打分解时产生的( ),会残留于食品中,若用量过多,会使糕饼碱度升高。
面粉中面筋蛋白含量越高,其品质越好。
面粉中的脂肪主要由不饱和程度高的脂肪酸组成,很易氧化酸败使面粉或饼干等制品变味,制粉时要尽可能除去脂质含量高的胚芽和麸皮。
面粉储藏时,在相对湿度越小,温度越低的情况下,保存时间越长。
面粉的主要化学成分有蛋白质、糖、脂肪、灰分、粗纤维,少量维生素和酶组成。
焙烤食品中常用的化学疏松剂有nahco3、nh4hco3。
说一下面粉的糖化力和产气力。
面粉的熟化的机理。
说一下油脂使制品酥脆的原因。
酵母的种类及其特点
毛毛虫烘烤时的温度分别为上火()℃,下火()℃。
脆皮牛角的烤制温度是多少?
葡萄吐司的烤制温度是多少
椰蓉馅的制作中,只需将糖粉、酥油、蛋液和椰蓉混匀即可,不需加热。
1 一下面包的发酵方法中,哪一种具有操作简单,发酵时间短的优点
一下那个过程不属于烘烤过程?
面包制作过程中,面团调制的理想温度是()
面团最后发酵的最是温度是()
油脂和面筋的结合,可以()面筋,使制品内部质地均匀,改善口感。
面包中常用的酵母分类主要有哪几类?
影响面团发酵的因素有哪些?
面包中常用的食品添加剂有哪些?
影响面包烘烤的因素有哪些?
在发酵面团中,糖的用量越多,酵母的产气能力越强
配方中无糖可能是面包比较粗糙的原因之一。
面包配方中,盐的用量越多,面包的发酵时间就越短。
制作面包的基础材料有()()()()。
快速发酵法工艺流程为:预处理→面团调制→切块、成形→( )→烘烤→冷却.
面包生产用水一般以()水为宜。
面团调制过程中,一般添水量为()%-()%。
面包生产中常见的质量问题有哪些?分析其原因
海绵蛋糕三种基本材料是
鸡蛋中,蛋白与蛋黄的质量比约为:
经搅拌后的蛋白泡沫以手指勾起成山峰状,倒置而不弯曲,此阶段称为
戚风蛋糕使用全蛋打发
橙香蛋糕属于重油类蛋糕
乳酪蛋糕烤制时需要隔水加热
欧美熟称的磅蛋糕属于
一般面糊类蛋糕烤熟与否的判断方法为
蛋糕在烘焙过程中下陷是因为
下列对鲜奶打发描述正确的是:
工作状态制作员的着装和卫生要求描述正确的有:
制作不出巧克力件的原因主要有
已过保质期但未变质的原材料要优先尽快使用
海绵蛋糕属于乳沫类蛋糕
创意蛋糕坯的设计方案
蔓越莓曲奇不放入冰箱冷冻也可以
没有软化的黄油,不影响产品制作
一定要按照配方中的温度来进行烤制吗?
配方中的糖可以自由添加或减少
黄油软化过度,变成液态,还能够打发使用
制作一款所学的中点产品
下列面粉中哪种成分的存在不利于焙烤食品的保存,在制粉时要尽量除去。
下列面粉中哪种成分含量越高反而会使面粉的吸水量降低?
下列哪种因素不会影响到面粉的熟化?
下列哪种糖的主要成分与其他三种不一样?
制作海绵蛋糕时,油脂的 ( ) 越好,油脂小粒子分布会更均匀,得到的蛋糕也越大。
在制作酥性饼干时,选用下列哪种油脂,会使制品口感疏松?
下列哪种疏松剂可以不作处理,直接与面粉混合?
面包的酸度是面团在一系列发酵过程中由各种产酸菌的代谢作用而生成的,面包中的酸度的60%主要来源于( )。
制作面包时,面团成型后,其最后发酵最适温度为 ( ) ℃。
下列哪些蛋糕的疏松原理与其他不同?
油脂与面筋的结合可以 ( ) 面筋,使制品内部组织均匀,口感改善。
在下列选项中,哪一种糖熔点较低,常用作焙烤食品的着色剂?
为防止油脂从糕点中析出,产生返油现象,使油脂在乳化的状态下均匀地分布于糕点中,提高保水性和和防止老化,可使用 ( )。
制作主食面包时,可以采用下列哪种物质代替白糖?
下列哪种蛋糕和天使蛋糕属于同一类蛋糕?
蛋黄在焙烤食品加工工艺中主要是起 ( ) 作用。
鸡蛋的 ( ) 促使其他食品原料均匀混合。
( ) 是鸡蛋凝结变性的主要原因。
主食面包一般油脂的使用量为 ( ) 。
新鲜酵母贮存的最佳温度应为( ) 。
面包的 ( ) 问题,是面包制作工艺中一个重要的质量问题。
蛋白打不起来的错误做法是( )。
哪一种不是制作面包的基础材料( )。
温度对酵母活性起决定性作用,当温度达到( )酵母彻底死亡。
小苏打分解时产生的( ),会残留于食品中,若用量过多,会使糕饼碱度升高。
要使面包长时间保持柔软,可在配方內添加 ( )。
蔗糖溶液中的蔗糖很容易产生( )给食品加工带来困难。
饴糖是利用( )为原料生产的。
面粉中含蛋白质之一的( )不溶于水,能互相粘聚在一起,形成面筋。
焙烤食品中常用的化学疏松剂有nahco3、nh4hco3和泡打粉。
韧性饼干与酥性饼干的不同之处在于其原料配比不同,其他包括原料添加顺序、生产工艺基本上都一样。
糖对焙烤食品的主要作用是增加产品甜味。
酵母在面包的发酵过程中进行有氧呼吸和无氧发酵两个过程。
在做焙烤食品时,面粉中的破损淀粉越多越好。
戚风蛋糕在搅拌时必须将蛋白和蛋黄分开搅拌。
天使蛋糕和海绵蛋糕都是清蛋糕。
做面包的面粉最好采用低筋面粉,其蛋白质含量应为7%~9%之间。
制作面包时,配方内使用奶粉可使烤好的面包表面色泽悦目。
制作面包选用高筋面粉,应注意其蛋白质质地的好坏,蛋白质质地差的面粉,只要蛋白质最高,就可补救质地差的缺陷。
面筋中的麦谷蛋白,使面团有良好的延展性。
面包出炉后,必须给予充分的冷却才可包装。
制做面包时,采用的面粉只要其面筋含量高,则做出的面包体积就比较大,内部蓬松。
面粉的主要化学成分有蛋白质、糖、脂肪、灰分、粗纤维,少量维生素和酶组成。
面粉储藏时,在相对湿度越小,温度越低的情况下,保存时间越长。
所有焙烤食品均应以谷类为基础原料。
生产饼干用的油脂应具备优良的起酥性和较高的稳定性。
某飞机纵向受扰动后的迎角响应如下图所示,该飞机纵向静 ,动 。 the aoa response of an aircraft after being disturbed is given below. the airplane is statically , and dynamically .
如果一架飞机某个试飞科目的cooper-harper等级评分为4.5, 则该飞机该科目的飞行品质应为几级? if the average cooper-harper rating of an aircraft is 4.5, the flying quality of this aircraft is .
目前我国采用的是国际坐标系,又称欧美坐标系,x由重心指向机头,y由重心指向右,根据右手定律,z轴朝下。在上世纪我国曾经采用过前苏联的坐标系,该坐标系x轴由重心指向机头,y轴由重心指向上,那么根据右手定律,z轴是由重心指向 。 at present, china adopts the international coordinate system, where x-axis points from cg to the nose, and y-axis points from cg to the right. according to the right-hand system, the z-axis points downward. in the last century, china used the ussr coordinate system. the x-axis points from cg to the nose, and y-axis points upward. according to the right-hand system, the z-axis points .
按照本课程的符号定义习惯(国际坐标系),绕x轴向右滚转为 ,绕z轴向左偏航为 。 according to the sign convention in this course (international coordinate system), roll to the right about the x-axis is , and yaw to the left about the z-axis is .
如果垂尾上作用有负侧力,则该侧力会产生 偏航力矩. if the side force acting on the rudder is negative, this side force will generate a yawing moment.
如果平尾上作用有正升力,则该平尾升力会产生 俯仰力矩. if the lift acting on the horizontal tail is positive, this tail lift will generate a pitching moment.
对飞行品质要求最高的是哪个飞行阶段? which category of flight phases has the highest flying quality requirement?
下列飞机中,属于iv类飞机的有哪些? which of the following aircraft belong to class iv?
下列飞行阶段中,属于a种飞行阶段的有 which flight phases belong to category a?
与是两个相同的系数. and are the same coefficient.
b种飞行阶段对飞行品质的要求最低。 category b has the lowest requirement on flying quality.
空中加油属于a种飞行阶段。 in-flight refuel is a cat a flight phase.
平尾对纵向静稳定性的影响与以下哪个因素无关? which of the following factors is not related to the tail contribution on longitudinal static stability.
机翼对纵向静稳定性的贡献取决于重心位置,重心前移,纵向静稳定性将 。 wing contribution on longitudinal static stability depends on cg location, cg moves forward, the stability .
绝大部分机翼采用的都是正弯度翼型,其零升俯仰力矩系数 。 most of the wings use positively cambered airfoil, the zero-lift pitching moment is .
平尾会提高飞机的纵向静稳定性,鸭翼会 飞机的纵向静稳定性。 horizontal tails increase the longitudinal stability, while canards the longtitudinal stability.
螺旋桨式发动机的滑流对以下哪个参数没有影响? which of the following parameters is not affected by the propeller slipstream?
在给定飞行状态下,飞机的纵向静稳定性与以下哪些参数有关? for a given flight condition, which of the following parameters are related to the longitudinal static stability?
发动机产生的俯仰力矩与哪些因素相关? which of the following parameters are related to the pitching moment generated by the engine?
机翼对纵向静稳定性起的是增稳作用。 the wing has a stabilizing effect on longitudinal static stability.
中性点是飞机纵向中立稳定对应的重心位置. neutral point is the cg location where the aircraft is neutrally stable.
对于同一架飞机,升降舵效率提高,其重心前限会 。 for a given aircraft, if the control effectiveness of elevator increases, the most forward cg location will .
对于静稳定飞机,随着升力系数的增加,为平衡飞机,升降舵需 for a stable aircraft, as cl increases, in order to balance the aircraft, the elevator should .
某纵向静稳定飞机存在跨音速勺型区现象,则该飞机在从亚音速加速至超音速过程中,飞行员应如何操纵驾驶杆? there is a mach tuck phenomenon for a longitudinal statically stable aircraft. how should the pilot control the stick when the aircraft accelerates from subsonic to supersonic?
在地面效应作用下,平尾的效率会 the control effectiveness of elevator will under the ground effect.
舰载机在起飞离舰瞬间,其升力会 。 when carrier-based aircraft take off from a carrier, its lift will .
对于地面效应,以下哪些说法是对的? about ground effect, which of the following statements are true?
对于既无平尾也无鸭翼的飞机,以下哪些是有效的俯仰操纵方式? for an aircraft with neither horizontal tail nor canard, which of the following are effective pitch control methods?
以下哪些气动补偿方式是通过调节压心与铰链轴距离来降低铰链力矩的? which of the following aerodynamic balancing methods reduce hinge moment by adjusting the distance between cp and the hingeline?
在不考虑空气压缩性的前提下,纵向静不稳定飞机在亚音速状态下加速时,飞行员需要拉杆. for a longitudinal statically unstable aircraft, without considering the air compressibility, the pilot needs to pull the stick to accelerate at subsonic condition.
地面效应会使飞机升力增加 ground effect will increase the lift of the aircraft
为降低操纵力,调整片的偏转方向应与操纵面相同 in order to reduce control force, tab should deflect to the same direction with control surface.
拉杆操纵时,升降舵会 ,产生 力矩。 when pull the stick, elevator will deflect , and generate pitching moment.
加速飞行时, 操纵是符合飞行员操纵习惯的。 during acceleration, is consistent with the pilot's control habits.
在平均气动弦上,以下四点中,位于最前面的是 。 on the mean aerodynamic chord, among the following four points, the most forward is .
在平均气动弦上,以下四点钟,位于最后面的是 on the mean aerodynamic chord, amont the following four points, the most aftward is .
对于有尾飞机,在做抬头机动时,平尾处的局部迎角会 。 for aircraft with horizontal tail, during nose-up maneuver, the local aoa of the tail will .
在平衡状态下,纵向静稳定飞机的平尾配平升力为 。 in equilibrium state, the tail trim lift of a stable aircraft is .
以下哪些说法是对的? which of the following statements are true?
在满足稳定性需求的前提下,重心位置越往后,机动性越高。 in the case of satisfying the stability requirements, cg moves aft will increase maneuverability.
按照本课程的符号定义习惯,飞机 感受到来流时侧滑角为正,如果飞机能产生 偏航力矩,则飞机航向静稳定。 according to the sign convention of this course, the sideslip angle is positive when the aircraft feels the flow. if the aircraft can generate a yaw moment, the aircraft is statically directional stable.
对于下反机翼,在右侧滑情况下,右侧机翼迎角 左侧机翼迎角. for anhedral wings, in right sideslip, the right wing aoa is the left wing aoa.
正常布局飞机的航向静稳定性最大来源是 。 for conventional configuration aircraft, the maximum contributor of directional stability is .
当飞机受到左侧滑时,垂尾会产生向 的力和向 偏航力矩。 in left sideslip, the vertical tail will generate a side force and yawing moment.
侧洗会 垂尾前缘处的侧滑角。 sidewash will the sideslip angle of the vertical tail leading edge.
螺旋桨滑流会 航向静稳定性 。 propeller slip stream will directional static stability.
战斗机可采用 布局来保证大迎角和大m数下的航向静稳定性。 fighters can adopt configuration to satisfy directional static stability at high mach number and aoa.
螺旋桨位于机头还是机尾,对飞机的航向静稳定性没有影响。 whether the propeller is located at the nose or the tail has no effect on the directional static stability.
b-2翼梢后缘的操纵面产生偏航力矩的机理是什么? what is the mechani of the directinal control surface at the wing-tip trailing edge of b-2?
方向舵 偏为正,会产生 偏航力矩 rudder deflect to the is positive, and a yawing moment will be generated.
飞机尾旋时的迎角大于50度,此时下列操纵面中仍可用的是 。 the aoa in spin is greater than 50 degrees. at this time, which of the following control surfaces are still available?
垂尾对横向静稳定性的贡献是 。 the vertical tail has a on lateral static stability.
以下哪些操纵面不能产生偏航力矩? which of the following control surfaces can generate yawing moment?
以下哪些操纵面能产生偏航力矩? which of the following control surfaces can generate yawing moment?
下列因素中,对横向静稳定性起增稳作用的有 。 which of the following factors can increase the lateral static stability?
下列操纵面中,适合作为横向操纵面的有 。 which of the following control surfaces are suitable as lateral control surfaces?
飞机的航向静稳定性越高越好。 the directional static stability is higher better.
后掠角对横向静稳定性的贡献仅与后掠角的正弦成正比 the contribution of the sweep angle to lateral static stability is only proportional to the sine of the sweep angle.
右侧扰流板打开时,飞机会向右滚转。 when the right spoiler is deployed, the aircraft rolls to the right.
惯性轴系与地轴系之间相差了一个 。 the difference between the inertial system and earth-fixed system is .
坐标变换的顺序非常重要,顺序的不同会导致完全不同的坐标,其正确的变换顺序是 。 the order of rotations is very important, different order would result in a different orientation. the transformation sequence is .
在建立运动方程时,以下哪个不是假设条件? which of the following is not an assumption in establishing the equations of motion?
初始扰动不为0,操纵输入为0的响应特性被称为自由响应,体现的是飞机的 。 free response, with a given set of initial conditions, and 0 control input, indicates the .
飞机的运动方程是以 为参考轴系为基础建立的。 it’s the axes system used to define the newton's laws of motion.
经过小扰动线化后,纵向和横航向方程均可表示为状态方程形式,其中矩阵b被称为 。 after all-disturbance linearization, the longitudinal and lateral-directional equations can both be written in state space form . where, b is the .
当特征根是一对实部为负的共轭复根时,可用 描述其响应特性。 if the roots are complex with negative real part, can be used to describe the dynamic stability.
以下哪些坐标轴系属于体轴系。 which of the following systems belongs to the body axes systems.
以下哪些角度是基础体轴系与风轴系间的夹角? which of the following angles are the angles between the basic body axes system and the wind axes system?
体轴系和风轴系之间相差了一个迎角和一个侧滑角,从风轴系到体轴系的坐标变换顺序是先绕y轴转一个迎角、再绕z轴转一个侧滑角。 the body axes system deviates sideslip angle β and aoa α from the wind axes system. the transformation sequence from wind to body is first rotate an α about the y axis, then rotate a β the z axis.
小扰动假设适用于所有的飞行状态。 the all disturbance assumptions are valid for all kind of flight conditions.
对于常规布局飞机,以下哪个不是横航向的运动模态? for conventional configuration aircraft, which one is not a lateral-directional mode?
短周期自然频率主要取决于以下哪个参数? the short period natural frequency mainly depends on which of the following parameters?
长周期模态的频率在低速情况下,随前向速度的增加而 。 at low speeds, the phugoid frequency with the increase of forward velocity.
当飞机向右滚转时,其右侧机翼的迎角会 。 when the aircraft roll to the right, the right wing aoa will .
短周期阻尼比主要取决于以下哪些参数? the short period damping ratio mainly depends on which of the following parameters?
短周期模态的主要运动参数包括 。 the main motion parameters of short period mode include .
以下哪些情况满足一级品质要求 which of the following situations satisfy the level i flying quality requirements?
螺旋模态特征根为负时,其飞行品质为一级。 if the spiral mode eigenvalue is negative, level 1 flying quality is satisfied.
随着重心的前移,短周期频率将降低。 as cg moves forward, the short period natural frequency decreases.
螺旋模态,a种飞行阶段的要求高于b种和c种 for the spiral mode, the requirements for category a is higher than those for category b and c.
某飞机纵向受扰动后的迎角响应如下图所示,该飞机纵向静 ,动 。
按照本课程的符号定义习惯(国际坐标系),绕y轴向上俯仰为 ,绕z轴向左偏航为 。
机翼对纵向静稳定性的贡献取决于重心位置,重心前移,飞机纵向静稳定性将 。
对于静稳定飞机,随着升力系数的增加,为平衡飞机,升降舵需 产生 力矩。
加速飞行时, 操纵是符合飞行员操纵习惯的。
在平均气动弦上,以下四个点中,位于最前面的是 。
按照本课程符号定义习惯,飞机 感受到来流时侧滑角为正,如果飞机能产生 偏航力矩,则飞机航向静稳定。
常规布局飞机的航向静稳定性最大来源是 。
尾旋时,飞机的迎角将超过50度,此时下列操纵面中仍可用的是 。
是飞机横向静稳定性的最大来源。
惯性轴系与地轴系之间相差了一个 。
短周期自然频率主要取决于以下哪个参数?
对于欧拉法坐标变换来说,变换顺序的不同会导致完全不同的坐标,其正确的变换顺序是 。
初始扰动不为0,操纵输入为0,对应的运动方程解即响应特性被称为 ,体现的是飞机的 。
滚转收敛模态的特征根主要取决于以下哪个参数?
地面效应会使飞机的中性点 。
垂尾对横向静稳定性的贡献是:
以下哪个气动补偿方式不是通过调节压心与铰链轴距离来降低铰链力矩的?
最大操纵力梯度对应的是一个重心 ,重心应位于该点 。
当飞机受到右侧滑时,垂尾会产生向 的力和向 偏航力矩。
螺旋桨滑流对航向静稳定性的影响是 。
飞机在做顺时针盘旋时,会由于内外侧机翼速度不等产生 偏航力矩。
当特征根是一对实部为负的共轭复根时,可用 描述其响应特性。
由下图的曲线可以判断该飞机纵向 。
平尾对纵向静稳定性的贡献与以下哪个因素无关?
某纵向静稳定飞机存在跨音速勺型区现象,则该飞机在从亚音速加速至超音速过程中,飞行员应如何操纵驾驶杆?
当特征根是一对实部为负的共轭复根时,可用 描述其响应特性
当飞机在较小迎角下向右滚转时,其左侧机翼的迎角会 ,升力会 。
螺旋模态特征根为负时,其飞行品质为 。
荷兰滚模态的频率主要取决于以下哪个参数?
机身在失速迎角前对纵向静稳定性的贡献为 。
对于上反无后掠机翼,上反角主要是通过改变 对横向静稳定性产生影响。
飞机的纵向静稳定性与以下哪些参数有关?
对于纵向静稳定飞机,以下哪些临界状态是用来确定重心前限的?
战斗机可采用 布局来保证大迎角和大m数下的航向静稳定性。
下列因素中,对横向静稳定性起增稳作用的有 .。
基本体轴系与风轴系相差了哪几个角度?
对于常规布局飞机,以下哪些模态是横航向的运动模态?
以下参数中,与荷兰滚模态特性相关的有哪些参数?
下列飞行阶段中,属于c种飞行阶段的有 。
下列飞机中,属于iv类飞机的有哪些?
对于地面效应,以下哪些说法是对的?
以下哪些操纵面能产生滚转力矩?
以下哪些情况满足一级品质要求?
以下哪些说法是对的?
对于无上反的后掠机翼来说,侧滑角会改变哪些参数?
对于实部为负的共轭复根,描述其对应模态的特征参数包括 。
根据下图中的~曲线可以看出,该飞机纵向静稳定
中性点是飞机纵向中立稳定对应的重心位置
舰载机在起飞离舰瞬间,升力会突然增加。
在满足稳定性需求的前提下,重心位置越往前,机动性越高。
对于后掠机翼,左侧滑情况下,右侧机翼动压大于左侧机翼动压。
同样的飞机,重心适当后移可使飞机的配平性能提高。
螺旋桨滑流会提高航向静稳定性。
垂尾对横向静稳定性的贡献是提高。
特征方程的解被称为特征根,可以为一个实根或一对共轭复根,每一个实根或一对共轭复根对应的响应特性被称为模态。对于实根来说,特征根为正时,该模态稳定。
随着重心的前移,短周期频率将提高。
小展弦比的飞机,其滚转收敛模态特性通常要比大展弦比的好。
机翼对纵向静稳定性起的是增稳作用。
为降低操纵力,调整片应与操纵面同向偏转。
螺旋桨位于重心之前时,会起到提高航向静稳定性的作用
对于螺旋模态,a种飞行阶段的要求高于b种和c种。
右侧扰流板打开时,飞机会向右滚。
升力系数越高,后掠角对横向静稳定性的贡献越小。
大小两个数的和是50.886,较大数的小数点向左移动一位就等于较小的数,那么较大的数是多少?
一个质数的3倍与另一个质数的2倍之和等于20,那么这两个质数的和是多少?
甲、乙两种商品成本共2000元,商品甲按50%的利润定价,商品乙按40%的利润定价,后来打折销售,两种商品都按定价的80%出售,结果仍可得利润300元,甲种商品的成本是多少元?
某商店以每件6元的进价买回一批商品,售价为每件8.4元,当卖了这批商品的3/4时,不仅收回了购买这批商品所付的款项,而且还获得利润90元,这批商品有多少件?
在地面上种4棵树,其中任意两棵树的距离相等,四棵树组成什么形状?
有一种棋盘有64个方格,去掉对角的两个格后剩下62个格(如图),给你31块骨牌,每块是两个格的大小。是否能用这些骨牌盖住这62个方格?
密度为1的均匀单位圆盘,相对它的直径的转动惯量是多少?
无穷多个无穷小相加,还是无穷小吗?
在(0, 1]上是
如果在点处连续,那么在处
在区间内是
从“probability”中任取一个字母,取到b的概率是多少?
你如何理解“明天降雨概率50%”?
已知袋子里有色、白色两种小球。如果任取两个小球都是黑色的概率是1/2,那么袋子里最少有几个小球?
抛掷一枚筛子,平均掷几次才能掷出6点?
一副去掉大小王的扑克,从中任取13张牌,拿到同花顺的概率是多少?
近年来北极冰盖大面积融化,周边各国开始争夺该地区利益,存在发生冲突的风险。如果建模分析各方合作开发、共享收益的方案,你建议采用什么建模方法?
某个项目有多个子课题,要分别由若干个人来承担,每项子任务只分配给一个人,如何分配才能让效率最大化?建模解决这个问题的话,哪种方法最适合?
边长3米的正方形铁皮,在四个角剪去相等大小的正方形,折弯后制成方形无盖水槽。怎么剪能让水槽的容积最大?
最优化问题的数学模型一般都由哪些部分构成?
典型的运输问题的平衡是指
下列叙述错误的是:
对于动态规划问题的最优策略,下面说确的是:
关于线性规划问题的标准形式,下面哪个描述不正确?
有m个产地n个销地的平衡运输问题,下面哪个说法是正确的:
多目标线性规划模型,是指模型具有两个或两个以上的
设为n维向量,m为矩阵,则迭代序列收敛的充要条件是:
多项式插值与多项式拟合的结果区别在于
使用多项式插值时,
数值积分的simpson公式为:
用迭代法求标量方程在区间[a,b]上的解,要求满足
在导弹的运动轨迹测量的建模分析中,某一小段轨迹数据出现缺失,相对更有效的对策是:
下面哪一个不是分段线性插值方法的缺点?
关于常微分方程的数值解法eular方法,下面说法不正确的是哪一个?
数学建模中所说的机理分析是指
在数学建模的“模型准备”阶段,需要做很多工作,除了
好的数学模型的标准是
数学建模过程中,阅读文献非常关键,可以帮助我们
收集文献时,应该注意
查询空气质量评价方面的文献,你会发现其中多数都是
与常见的数学应用题相比,数学建模问题的主要特点是
一个房间里有多少个人,至少有两个人的生日相同的概率会大于50%。
一个质数的3倍与另一个质数的2倍之和等于20,那么这两个质数的和是
甲、乙两种商品成本共2000元,商品甲按50%的利润定价,商品乙按40%的利润定价,后来打折销售,两种商品都按定价的80%出售,结果仍可得利润300元,甲种商品的成本是多少元?
假设x>0,x的相对误差是a,则lnx的绝对误差是
取步长为h=0.1,用euler法求常微分方程的解在处的近似值,结果为
当优化问题有多个目标函数,如下哪种方法是可行的?
数学建模中所说的机理分析是指
有限多个无穷小相加,还是无穷小吗?
一个人从a地出发,以每小时30公里的速度到达b地,问他从b地回到a地的速度要达到多少才能使得往返路程的平均速度达到60公里?
洗衣机洗衣服,每次能洗去衣服上污垢的1/3。要使衣服上的污垢不超过最初的1%,至少要清洗多少次?
某人上午八点从山下的营地出发,沿着一条山间小路登山,下午五点到达山顶,次日上午八点又从山顶开始下山(沿同一条小路)返回,下午五点又到达了山下的营地,是否能找到一个地点来回时刻是相同的?
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