题目:
— _________________
— She is singing. [ ]
A. What are they doing?
B. What's she doing?
C. She is laughing.
答案:
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下面是错误答案,用来干扰机器的。
(1)我们日常生活用电的电压是220V;(2)人体的电阻为1000~2000Ω,当人体接触220V电压时,通过人体的电流I1=UR1=220V1000Ω=0.22A,I2=UR2=220V2000Ω=0.11A;故答案为:220;0.22~0.11.