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说的是三线插头上比另外两根插脚长3毫米的地线插脚的作用:【“救命三毫米”什么意思?干电工的一定要弄明白,关键时刻能救命】https://haokan.hao123.com/v?pd=share&context=%7B%22nid%22%3A%22sv_3326267153001894643%22%2C%22sourceFrom%22%3A%22bjh%22%2C%22uk%22%3A%222h7p4uY3DkxcUdWtBkq-CA%22%7D&vid=3326267153001894643&isBdboxShare=1
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