常見(jiàn)例句雙語(yǔ)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.閥瓣采用彈簧加載，其快速關(guān)閉能有效的減小水錘壓力，密封性能好，關(guān)閉無(wú)噪聲。www.usakv-k.com 返回 quick closedown