... double battery switch 双电池开关 battery switch board 蓄电池配电板 battery switch pilot 蓄电池开关指示灯 ...
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common battery telephone switch board 共电电话交换机
A teaching demonstration circuit board consists of a receiver, a battery holder, a steering engine, a touch switch, a transmitter, a steering box and light emitting diodes.
一种教学用演示电路板，由接收机、电池盒、舵机、触碰开关、发射机、舵盒、发光二极管组成。
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