In the course of the second water distribution, the vertical diffusing speed is faster than level diffusing speed.

在水分再分布过程中，垂直方向的扩散速率始终大于水平方向。

youdao

This paper introduces the standard of high quality drinking water, purification technology, offering, design of distribution network and prevention and cure of the second pollution of water.

介绍优质饮水水质标准，净化工艺技术与供应，管网设计以及水的二次污染的防冶。

youdao