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煤矿井下供电系统的、、统称为煤矿井下三大保护

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井下保护接地系统由、、、、和等组成。

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.