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这句话怎么翻译?

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A switch which simultaneously shuts off the laser diode voltage and shorts the laser anode to cathode must be closed while the circuit power is being turned on or off.翻译好久了总是不通顺


IP属地:广东来自iPhone客户端1楼2016-05-18 23:36回复
    电路电源开或关时....xxx开关要保持闭合。


    IP属地:北京来自Android客户端2楼2016-05-19 07:12
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      控制电压,镭射,


      IP属地:广东来自iPhone客户端3楼2016-05-19 10:11
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