valve oil阀油
valven.瓣膜;真空管;阀门;电子管
valve-controlled asymmetric cylinder system阀控非对称缸系统
valve-controlled internal combustion engine气门式内燃机
Valve controlled asymmetric hydraulic cylinder阀控非对称液压缸
VALVE MANUFACTURERS CONDENSED CROSS-REFERENCE LIST阀门制造商主要型号对照表