Were there no transformers to switch the voltage, long-distance transmission of electricity would be impossible?
要是没有变压器来调节电压，远距离输送电力是不可能的。
The double speed switch has the advantages of simple structure and good transmission effect.
这种结构的双速开关结构简单、传动效果好。
The double speed switch has the advantages of simple structure and good transmission effect.
这种结构的双速开关结构简单、传动效果好。
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