论文部分内容阅读
科学家在一个水质完全符合卫生标准的地区,对仅使用了100天的保温瓶进行了水垢成分分析,发现其中含有铅、砷、镉、汞、硝酸盐和亚硝酸等有害物质。一旦水的酸碱度发生变化,
Scientists in a water quality fully meet the health standards of the area, only 100 days of thermos flask used for scale composition analysis and found that it contains lead, arsenic, cadmium, mercury, nitrite and nitrite and other harmful substances. Once the water pH changes,