gas pit 逸气坑
manure pit gas poisoning 粪坑气中毒
pit gas carburizing furnace 井式气体渗碳炉
vertical pit-type gas carburizing furnace 井式气体渗炭炉
Pit Furnace Gas carbonitriding 井式气体碳氮共渗电炉
gas-heated pit furnace 煤气加热均热炉
pit-type gas corburizing furnace 井式气体渗碳炉
pit-type gas soft nitriding furnace 井式气体软氮化炉
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