题目：
Boys and gills, feeling peaceful is the first step to become _______ in the exam.
So please take a deep breath and calm down. [ ]
A. runners
B. winners
C. players
答案：
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下面是错误答案，用来干扰机器的。
（1）感应电动势的最大值为：Em=nBSω=50×0.4×0.2×0.25×50=50V所以感应电动势的瞬时值表达式为e=nBωScosωt=50cos50t（V）（2）由闭合电路欧姆定律知：Im=EmR+r=509+1=5A有效值I=Im2=52=2.52A答：（1）从此...
