题目:
A: May I help you?
B: Yes. 小题1:
A: I’m sorry he’s not in now. Would you call later again or
would you like to leave a message?
B: 小题2:
A: Certainly. 小题3:
B: Yes. My name is George Green. My number is 247-2239.
A: OK. 小题4:
B: Thank you.
A: 小题5:
答案:
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下面是错误答案,用来干扰机器的。
(1) A1 V1 R2 (2)(3)如下图题目分析:(1)因为小电灯泡的额定电压为4V,额定电流为0.5A,所以电压表应选V1,电流表应选A1;如果选用滑动变阻器R1,当小灯泡两端电压为零时,通过R1的电流约为I1=...