题目:
用方框里适当的句子补全对话。 | |
B—1_____ But I don't have a tennis racket. Do you have a tennis ball? A—No, I don't. But I have a soccer. 2_____ B—No. 3_____ Let's play ping-pong. I have a ping-pong bat. A—4_____ B—It's in my backpack. Do you have a bat? A—No, I don't. But my brother has a bat and a ball. B—Good. Where is he? A—5_____ |
答案:
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答案:C题目分析:由欧姆定律的内容通过电阻的电流强度跟它两端的电压成正比,跟它的电阻成反比,A错;由U=IR,对一定的导体,导体的阻值不变,所以通过它的电流强度越大,它两端的电压也越大,B错;R=U/I是电阻...