bosun's chair hitch

基本解释坐板升降结

网络释义

1)bosun's chair hitch,坐板升降结2)deck elevating ocean structure,升降甲板海洋结构物3)lifter slide,升降滑板4)adjustable end stop,升降档板5)scuttle cover,升降口板6)adjustable end stop,升降挡板