航行灯，应急灯均可由主、应急电源供电。
The navigation lights and signal lights power is supplied both by main and emergency sources.
该仪表可适用于野外没有电力电源供电的场合。
The instrument can be used in the circumstance of no power supply.
将原来使用的交流UPS电源供电改为直流电源模块供电；
The AC UPS used before has been replaced by the DC module power supply nowadays.
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