题目：
根据对话内容，从方框内的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。 A: What’s the date today? B: It’s June 16. A: 小题1: Then it’s Dragon Boat Festival today, isn’t it? B: Yes. 小题2: A: Did you have rice dumplings this morning? B: Sure. 小题3: A: I didn’t. B: What a pity! But I happen to have got some with me. 小题4: A: I’d love to. By the way, why do you call it Dragon Boat, Festival? B: Because in China, people race dragon boats this day every year. A: Oh, I see. 小题5: B: You are welcome.
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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）0-1×10-2 s时间内D处于导通状态，则电路总电阻R=R3+R1R2R1+R2 ① 通过R3的电流I=UABR ② 由①②式代入数据解得I=1 A ...
