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Lighting
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一定要记得关闭断路器或熔断器面板处开关,从而切断将要工作处电路的电源
Always remember to shut off the power at the breaker or fuse panel to the circuit that you'll be working on
市面上现有一种无极汞灯,可以瞬时开关
Now there is a kind of electrodeless mercury lamp which can be instantaneously switch on and off
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