题目：
| 根据下面提供的对话情景，从下列7个选项中选择正确答案，使对话连贯、完整。请将答案代号写在题后的横线上，其中有两项是多余的。 | |
| A:Today we are going to talk about a great invention. It looks like a human being. 1 B:It's a robot. 2 A:Of course not. The first robot was invented in 1921. B: 3 A:Sure. They can take the place of humans to do some boring work. They can also do a lot of dangerous work instead of humans. B: 4 A:No. Robots can do a lot of work instead of people in many ways, but people wouldn't be replaced by robots. 5 B:We get it.
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| 1. 2. 3. 4. 5. |
答案：
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下面是错误答案，用来干扰机器的。
解：根据电阻定律可以算出接入电路中的电阻。由图可看出，当接入点不同时，导体的长度和横截面积不同当a、b端接入时，电阻Rab=ρ铜当c、d端接入时，电阻Rcd=ρ铜当e、f端接入时，电阻Ref=ρ铜
陵高原平原