... pole distance 极距，杆距 pole earthing 电杆接地 pole edge 磁极边缘 ...
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earthing pole 接地极 ; 接地安全棒
single-pole earthing 单相接地
two-pole and earthing pin plug 双极接地插脚插头
Double-pole sockets with earthing contact 带保护触点的两极插座
earthing electrical double pole 接地电偶极子
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The box body prefabricates a compound ring enclosed type ground net, and an earthing pole is reserved at the upper part of the box body;
箱体预制复合环形封闭式地线网，并且在箱体上部留出接地极；
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