试题与答案

Don't laugh at her. She is_____ any of t

题型:选择题

题目:

Don't laugh at her. She is _____ any of the students in your class. [ ]

A. as clever a student as

B. as a clever student as

C. so clever a student as

D. so a clever student like

答案:

答案:A

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题型:选择题
一矩形线圈在匀强磋场中绕垂直于磁场轴线匀速转动时产生的正弦式交变电流,其电动势的变化规律如图线a所示.当调整线圈转速后,电动势的变化规律如图线b所示.以下关于这 两个正弦式电流的说法正确的是(   )

A.图线a电动势的有效值为75V

B.线圈先后两次转速之比为2:3

C.在图中t=0时刻穿过线圈的磁通量均为零

D.图线b电动势的瞬时值表达式为e=100sin(100πt/3)(V)

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