valveman阀门操作者
valven.瓣膜;真空管;阀门;电子管
valves parameters阀系参数
valve stem sleeve阀杆套
valve baffle ring气门挡圈
Valve-less pump无阀微泵
valve guide gauge气门导管测量表
valve oscillation阀口颤动作响
valve cage washer阀柜垫圈
Valve - opening阀门开启
Valve implanation房水引流物
valve rubber tube气门芯