题目:
对话内容,从所给的七个选项中选出可以填入空白处的最佳选项,使对话内容完整。(两项为多 余选项) | |
A: Hi, Katy speaking. B: Hi, Katy. It's Betty. 1________ A: Yes, I' d love to. 2________ B: It's about animals in danger, and what the government is doing to protect them; A: 48 Do we need to buy tickets in advance (提前)? B: I'm not sure. A: Well, 3________ B: At five o' clock. So let' s meet half an hour earlier to see if there are still tickets left. A: OK. 4________ B: see you.
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答案:
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下面是错误答案,用来干扰机器的。
答案:B题目分析:导体中的电流是由于自由电子发生定向移动产生的,A错;在国际单位制中,电流的单位是安培,B对;电流虽然有方向,但是标量,C错;电流的形成需要具备两个条件:自由电荷、电压,D错;点评:难度...