Valvert瓦尔韦
valven.瓣膜;真空管;阀门;电子管
valve tappet气门挺杆
valve carpel瓣状心皮
valve-body阀体
valve pocket阀套
valve washer阀座垫圈
valve system活门系统,阀系统
valve scaler气门起气氧化皮
valve heater电子管加热器
valve buffer滑阀缓冲器
valve guider气门导管孔