The lock keeper closed the lock gate. 船閘管理員關(guān)上了閘門(mén)。
And some suggestions for gate vibration study are made. 并對進(jìn)一步做好水工閘門(mén)的振動(dòng)研究工作提出了建議。
Butterfly valves have a wider range of chemical resistance due to the trim options and choice of elastomeric liners. 由于蝶閥能夠采用各種表面處理技術(shù)和選擇彈性材料管道，所以蝶閥具有極強的化學(xué)防腐性能。
All butterfly valves may incorporate the use of silicone in either grease or aerosol form during the assembly. 在組裝期間，所有蝶閥都可能接觸到潤滑脂或氣溶膠噴射中的硅酮。
