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NSA─500─1型钨极手工氩弧焊机的使用与维护技术空军第一航空学院(464000)郭必新OperationandMaintenanceTechniqueofNSA─500─1TungstenManualArgonArcWeldingMachineA...
NSA ─ ─ 500 ─ ─ type tungsten arc welding machine use and maintenance of the first technology Air Force First Aviation Institute (464000) Guo Bi Xin OperationandMaintenanceTechniqueofNSA─500─1ThrowManualArgonArcWeldingMachineA ...