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井下保护接地系统由、、、、和等组成。

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根据《煤矿安全规程》的规定：哪些地点应装设局部接地极？

M1: Did you watch the football match on TV last night?M2: Yes. I never miss a single football match.M1: You are really crazy about football.

M: Do you take exercise regularly?W: Yes. I play table tennis on Tuesday and go swimming on Friday.M: No wonder you look so terrific.

W: You look tired. Have you been exercising?M: Yes. We’ve just had a basketball match against Class Two.W: Who won?M: They did.W: What was the score?M: Seventy to sixty-seven. Susan, do you like playing basketball?W: No, actually I just like watching it.M: Do you still take a long-distance run every day?W: No, just sometimes.M: It’s a very good exercise.