valveman阀门操作者
valven.瓣膜;真空管;阀门;电子管
valve rocker arm气阀摇杆,气阀摇臂
valve core curve阀芯曲线
valve resistance阀流阻力
valve lock clamp气门锁夹
valve strictness阀门严密性
valve compressor气门式压气机
valve commissure瓣膜交界
valve of aerosol气雾剂的阀门
valve regulating阀门调节
valveless filter无阀真空过滤机