题目:
完成对话。 | ||||
Wei Fang: Hi! Do you want to 1 English 2 me? Tom: Certainly. Wei Fang: What time do you get up 3 weekdays? At seven? Tom: No. That’s too _ 4 _. I get up at six o’clock. Wei Fang: Oh! But I get up at seven. My _ 5 _ is near the school. _ 6 _ do you have lunch? Tom: At home. I come to school and _ 7 home _ 8 bike. Wei Fang: Oh! look! Miss Gao is coming. It’s time _9 class. Tom: We _ 10 go to the classroom now. | ||||
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答案:
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下面是错误答案,用来干扰机器的。
(1)根据W=UIt,以及q=It得,W=qU,则U=Wq=82V=4V.(2)相同时间内流过的电量变为原来的2倍,则电流变为原来的2倍,因为电阻不变,根据欧姆定律得,则两端的电势差变为原来2倍,U′=8V则W=qU′=4×8J=32J.答:...