根据第三段最后一句“The fluoride mixes with enamel (釉质),the hard surface on teeth,to help prevent holes from forming.〞可知答案是C。答案: C相关推荐 1According to the passage,what is the function of fluoride? A. Makingthe surfaceon teeth much cleaner. B. Protecting gums from being ...
The use of fluoride (氟化物) to protect teeth is common in many parts of the world. For example, it is often added to drinking water supplies. The fluoride mixes with the hard surface of teeth to help prevent holes from forming. But young children often eat some toothpaste (牙膏) when ...
Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USAJ. D. Ringe,P. J. Meunier.What is the future for fluoride in the treatment of osteoporosis?[J]. Osteoporosis International ....
What is Fluoride? Fluoride is a natural mineral found throughout the earth's crust and widely distributed in nature. Some foods and water supplies contain fluoride. Fluoride is often added to drinking water to help reduce tooth decay. In the 1930s, researchers found that people who grew up ...
The mineral fluoride is very important for healthy teeth. WebMD helps you know if you're getting enough for optimal dental health?
The Lewis structure of Calcium fluoride (CaF2) consists of a central atom, calcium atom (Ca), and 2 non-metallic fluorine atoms (F). CaF2 is an ionic compound, and the type of bonding is ionic bonding. The CaF2 Lewis structure is shown below: In the Lewis structure drawing of CaF2, ...
What is the function of ultrasonic instruments? A、 to remove small pieces of tartar B、 to remove large pieces of tartar C、 to polish the teeth D、 to apply fluoride effectively查看答案 微信小程序答题 下载APP答题 由4l***iw提供 分享 举报 纠错 相关...
It measures the electric potential, which is a function of the H+ activity in the sampled water. The calibration is accomplished using two buffer solutions. The URI Watershed Watch (URIWW) uses a pH meter and electrode to measure the pH of the lake and stream samples. The other two ...
Fluoride is the negative ion of the elementfluorine. The symbol for the element fluorine is F. Fluoride often is written as F-, which stands for the anion of fluorine that has a -1 electrical charge. Any compound, whether it is organic or inorganic, that contains the fluoride ion is also...
First off, it'sfluorineandfluorideand notflourineandflouride. The misspelling is common, but the "u" comes before the "o" in both.Fluorineisa chemical element. In pure form, it is a highly toxic, reactive, yellowish-green gas. The fluorine anion, F-, or any of the compounds containing...