题目:
口语应用。从方框中选出最佳选项补全对话。 | |
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,