常見例句雙語例句The valve petal uses the spring to load, its quick closedown can effective reduce the hammer pressure, the sealing property is good, the closure does not have the noise.閥瓣採用彈簧加載，其快速關閉能有傚的減小水鎚壓力，密封性能好，關閉無噪聲。www.usakv-k.com 返回 quick closedown