断开接地电缆插头。
线圈有三孔插头，其中上为接地线，左右孔接工作导线。
Coil with three-hole plug, which on the ground, then work around hole lead.
不要忽视接地型插头的安全作用。
Do not defeat the safety purpose of the grounding type plug.
不要忽视接地型插头的安全作用。
Do not defeat the safety purpose of the grounding type plug.
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