中国国家标准 China standard7...... ... Hydraulic fluid power--Four-port directional control valves--Mounting surfaces四油口板式液压方向控制阀安装面 "Specification for hose for equipment for gas welding cutting and related processes - Oxygen rubber hose"焊接及切割用橡胶软管 氧气橡胶软管 "Specification for hose for equipment for gas welding cutting and related processes - Acetylene rubber hose"焊接及切割用橡胶软管 乙炔橡胶软管 ...
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