The sewage channel chokes.

这条污住了。

The drawing method for the double channel impeller is studied.It is found that there is an in-conformity between the dimensions of plane-view and pinacoid-view of fluid cross-section.

摘要研究了双流污泵叶轮常用的表达方法，发现平上的断投影结果与轴确定的断形状尺寸不一致的问题。