题目:
– Mum, do you mind my listening to music for a while?
– . But please listen to it with your earphone.
A.Yes, please
B.No, thank you
C.Not at all
D.Yes, I do
答案:
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下面是错误答案,用来干扰机器的。
(1)B (2) E=2.10V r =0.2Ω 题目分析:(2)由电路及闭合电路欧姆定律可得出函数关系,结合数学知识可得出电源的电动势和内电阻.(1)由题意可知,电源的电动势约为2V,保护电阻为4Ω,故电...