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.

youdao

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.

youdao