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搭铁线就是一种电流的回流线,电源从电瓶正极出来,经过各种开关、电器执行机构、再经过一根回流线回到电瓶负极,形成一个循环,使电器产生各种各样动作和功用,汽车上采用的是单线制,即大多数线都是来自电源的,各种用电执行机构的回路不都是直接到电瓶负极的,而是通过汽车本身的金属机体间接地回到电瓶负极的,但凡连接到汽车金属机体的线我们都可以统称搭铁线。
Ground wire is a current return line, the power from the battery positive pole, after a variety of switches, electrical actuators, and then through a return line back to the battery negative, forming a loop, so that a wide range of electrical appliances Action and function, the car is using a single-wire system, that is, most of the lines are from the power supply, all kinds of electricity implementing agencies of the circuit is not directly to the battery negative, but through the car itself indirectly back to the metal body To the battery negative, but connected to the metal body of the car we can collectively referred to as the wire.