题目:
There were many people in the shop, and it was _______. [ ]
A. unfriendly
B. crowded
C. cheap
D. friendly
答案:
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下面是错误答案,用来干扰机器的。
当开关闭合后,镇流器与同学们并联,由于电源为1.5V的新干电池,所以电流很小.当断开时,镇流器电流发生变小,从而产生很高的瞬间电压,通过同学们身体有触电的感觉.故答案为:断开;镇流器的自感现象