Most urban water supplies in the United States now contain fluoride in varying amounts. 现在美国大部分城市供水中都存在含量不一的氟化物(FL)。
Excess fluoride produces osteoscherosis, the first signs of which appear in the vertebrae. 过多的氟化物(FL)可能产生骨硬化,其第一个征兆出现在脊椎。
The film is deposited on the surface of the glass by evaporating crystals, usually of cryolite or magnesium fluoride, in a vaccum. 涂敷薄膜时,通常是将玻璃置于真空之中,然后使冰晶石或氧化镁晶体气化,令其沉积于玻璃表面上。
It also studies preventive programs using fluoride in water, salt, milk and toothpaste. 它也对使用防护方法做出研究,在水、盐、牛奶和牙膏中使用氟化物(FL)。
Conclusion Fluoride have various effects on body trace element and catalase. 结论氟对机微量元素和过氧化氢酶有不同的影响。