Polders working together with embankment, sluice and ditch can block the flood.
Polders working together with embankment, sluice and ditch can block the flood.
平行水闸轴线剖切得到的剖视图是什么?What is the ... axis of the sluice?
平行水闸轴线剖切得到的剖视图是什么?What is the ... axis of the sluice?
某对称水闸宽度方向水平尺寸基准的位置是什么?What is ... a symmetric sluice?
某对称水闸宽度方向水平尺寸基准的位置是什么?What is ... a symmetric sluice?
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