Zhaoyuan section is the frontage of monitoring water quality of Songhua River main stream.

松花江肇源江段是松花江干流水质监测的前哨。

youdao

Zhaoyuan section is the frontage of monitoring water quality of Songhua River main stream.

松花江肇源江段是松花江干流水质监测的前哨。

youdao