Safety voltage, use is convenience, Average life is 1000h.
安全电压，使用方便，平均寿命1000小时。
General requirements of safety and technical for underground coal mine. loW voltage power sup...
煤矿井下低压供电系统及装备。通用安全技术要求。
General requirements of safety and technical for underground coal mine. loW voltage power sup...
煤矿井下低压供电系统及装备。通用安全技术要求。
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