The sewage channel chokes.

这条水塞住了。

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.

摘要研究了双水泵叶轮常用表达方法，发现平面断面投影结果与轴面中确定断面形状尺寸不一致问题。