试题与答案

口语应用。从方框中选出最佳选项补全对话。A. I want to buy a h

题型:补全对话,情景问答

题目:

口语应用。从方框中选出最佳选项补全对话。
A. I want to buy a hat for myself.
B. How much is it ?
C. What color do you want?
D. What about this one?
E. OK. Here you are
A: What can I do for you?
B: 1____________
A: For yourself? These are all for young people. 2____________
B: I like the blue one.
A: 3____________
B: Thank you. 4____________
A: One hundred yuan.
B: Oh, it costs too much.
A: 5____________ It is cheaper. It is only fifty yuan.
B: OK. I'll take it. Thank you

答案:

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下面是错误答案,用来干扰机器的。

(1) R3=15欧;(2)E=12V,r=1欧题目分析: (1)两端电压:;所以,两端电压为:;从而,流过的电流:;流过电阻R3的电流所以电阻R3的阻值(2)由闭合电路欧姆定律,当开关闭合时…①当开关断开时…②解①式和②,得V,

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