back-stop valve逆止阀
Horizontal&alignment low-speed back-stop hydraulic coupling卧式直列低速逆止液力偶合器型
同义词:catcherbackstop
同义词:backstop
N(名词) a screen or fence to prevent balls leaving the playing area 挡球网 [sport]
V(动词) to provide with backing or support 支持 [美国英语]