氟化物
5.To add a fluorine compound to(a drinking water supply, for example) for the purpose of reducing tooth decay.
6.The addition of a fluorine compound to a drinking water supply for the purpose of reducing tooth decay.
7.Study on Emission Permit of Total Quantity Control of Air Fluoride in Baotou City
8.The Study on Controlling and Managing Total Quantity of Air Fluoride Emission in Baotou


