From tesing, a certain degree of pollution has been caused by those substances in Lanzhou, Baotou and Zhengzhou segments of the Yellow RiverIS master stem.

• 据检测，在黄河干流兰州段、包头段和郑州段等河段已存在一定程度的“三致”物污染，应尽早开展饮用水水源地“三致”毒物污染监测。