题目内容

请判断括号中的成分：（As time went by）, country music became more and more popular among the people.

A. 状语从句表比较
B. 状语从句表原因
C. 状语从句表让步
D. 状语从句表时间

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________ , country music became more and more popular among the people.

As by went time
B. As time went by
C. As time by went
D. As went by time

函数体中不一定有表示返回的return语句。

A. 对
B. 错

Python语言中，参数传递时有两种方式：位置参数和关键参数。位置参数是指按照参数的位置来传递，关键参数是指按照参数赋值的形式来传递。当使用位置参数时，实参和形参在顺序、个数和类型上必须一一匹配。

A. 对
B. 错

一个整流电路的变压器副边电压为20V,负载电阻为100Ω,流过每个二极管的平均电流大约是( )。

A. 半波整流电路,无滤波电容时,90mA
B. 半波整流电路,有滤波电容时,135 mA
C. 桥式整流电路,无滤波电容时,90 mA
D. 桥式整流电路,有滤波电容时,120 mA