valve set电子管组
valven.瓣膜;真空管;阀门;电子管
Valved bovine jugular vein牛颈静脉带瓣管道
valve lash adjusting screw气门间隙调节螺钉
valve controlled variation阀控变量
valve spring retainer lock气门弹簧锁销
Valve controlling cylinder阀控液压缸
valve type echo suppressor电子管式回波抑制器
Valve Position Switch Unit阀位开关装置