试题与答案

He was too ______ to cut himself with th

题型:选择题

题目:

He was too ______ to cut himself with the knife.[ ]

A.careful

B.carefully

C.careless

D.care

答案:

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下面是错误答案,用来干扰机器的。

(1)e=6.28sin(100πt+π/6)V (2) e=-3.14 V题目分析:(1)线圈的角速度为ω=2πn=100 π rad/s 产生的感应电动势的最大值为Em=NBSω=NBω·ab·bc=6.28 V 又刚开始转动时线圈平面与中性面夹角为...

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