if c is defined with a and b as the parent classes, the correct way to write the first line of code when defining c is ( ).
关于ieee802.3的ca/cd协议，下面结论中错误的是（ ）。
以下（ ）不属于数字信道的模拟传输方法。
人的身心发展是在社会实践过程实现的。()
the value of the largest element in tuple t can be obtained by max(t)
the scope of a local variable is ( ).
in the following options, the correct descriptions include ______.
以下均可出现语颤减弱，除了
若ppp帧的数据段中出现比特串“01011111001”，则采用零比特填充后的输出为( )
there is a function fun without any parameters in the m module, and the fun function in the m module can be directly called by "fun()" in the script file n.py. the correct import methods include ( ).
the comments are to enhance the readability of the program, instead of actually running.
限制民事行为能力人订立的合同都是效力待定合同。
当一台主机从一个网络移到另一个不同的网络时，以下说确的是（ ）。
if b is the parent class of a, a is an object of class a, and b is an object of class b, then the statement isinstance(a, type(b)) returns true.