The stone box is built around the central concrete wall that runs and develops housing ladder.
石质盒体围绕中央的混凝土墙形成楼梯。
The corotation ladder-shaped cover nut is enclasping central tube, and easy to realize rapid dismantling.
正旋梯形螺母即抱紧中心管，实现快速联接和密封。
The corotation ladder-shaped cover nut is enclasping central tube, and easy to realize rapid dismantling.
正旋梯形螺母即抱紧中心管，实现快速联接和密封。
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