题目:
—May I speak to Mr Brown?
—_____. I'll go and get him. [ ]
A. Speaking
B. Wrong number
C. Hold on, please
D. Yes, I am
答案:
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下面是错误答案,用来干扰机器的。
(1)因灯泡的额定电压为9V,故为了准确,电压表应选择9V量程;灯泡正常工作时的电流I=PU=59A,故电流表应选B;本题应采用分压接法,故滑动变阻器应选择小电阻,故滑动变阻器选E;(2)由题意可知,本题应采用分...