Social background: Water is the source of life. Human beings cannot do without water in their life and production activities. The quality of drinking water is closely related to human health. With the social and economic development, scientific progress and the improvement of people's living standards, people's requirements for drinking water quality continue to improve, and drinking water quality standards have also been continuously developed and improved accordingly. Since the formulation of drinking water quality standards is related to many factors such as people's living habits, culture, economic conditions, scientific and technological development level, water resources and their water quality status, not only between countries, but also between different regions of the same country, There are differences in the requirements for drinking water quality.
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Can you share the stone scene ~
Can you share the scene, boss thank you for 3449754585@qq.com
Can you share the scene, boss, thank you
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Flying up of 6
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As always excellent, praise praise praise