污水道

The sewage channel chokes.

这条污水道塞住了。

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.

摘要研究了双流道污水泵叶轮常用的图纸表达方法，发现平面图上的断面投影结与轴面图中确定的断面形状尺寸不一致的问题。