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汽车、拖拉机的电源（蓄电池和发电机）,有的采用正极搭铁,有的采用负极搭铁。车上直流发电机（以下简称发电机）的搭铁极性应与蓄电池的搭铁极性一致,
Car, tractor power (battery and generator), some with positive ground, some with negative ground. On board DC generator (hereinafter referred to as the generator) of the ground polarity should be consistent with the battery ground polarity,