单项选择题

描述函数是指非线性环节输出的基波分量与输入正弦量的复数比。( ) A. 对 B. 错

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多项选择题

地下水露头的调查中,应用最多的是(   )。

A.水井
B.泉
C.钻孔
D.河流

单项选择题

‍Which of the following descriptions of the Beatles are incorrect____.‎

A.The Beatles extremely popular during the British Invasion.
B.The longest song by The Beatles on the charts is "the Fab Four".
C."Hey Jude" is one of the famous song by The Beatles.
D.The Beatles are the most famous rock band.