氟
1、属于卤素的一价非金属元素,正常情况下是一种浅黄色的、可燃的、刺激性毒气,是已知的最强的氧化剂之一 ——元素符号F。
同样的,如果我们观察二价的氟,它是每摩尔160焦。
Likewise, if we look at fluorine in its diatomic molecule, it is 160 kilojoules per mole.
如果你需要的话,你的牙医可以给你开更高浓度含氟凝胶,牙膏或漱口剂。
Your dentist can prescribe a stronger concentration of fluoride in a gel, toothpaste or rinse if you need it.
一些业内人士显然不想购买氟氯化碳替代品,因为后者的价格是氟氯化碳的5倍。
Some in the industry apparently do not want to pay for CFC substitutes, which can run five times the cost of CFC's.
这些发现提供了更多证据,表明了在可食用动物身上使用氟喹诺酮类药物会带来哪些问题。
The findings add to the growing body of evidence suggestive of the problems of using fluoroquinolonones in food-producing animals.
一升茶树含有高达9毫克的氟化物,过量会导致氟骨症,降低骨骼质量,导致疼痛和韧带僵硬。
A litre of teacan contain up to 9mg of fluoride, which in excess can cause skeletal fluorosis, reducing bone quality and causing pain and stiffening of the ligaments.
第三溶剂是含氯氟碳氢化合物。
The third solvent is a hydrochlorofluorocarbon.
三苯基膦被全氟烷基取代基所取代。
Triphenylphosphine has been modified by attachment of perfluoroalkyl substituents.
生产了各种芳基三氟甲磺酸酯。
Various aryl triflates were produced.
氢氯氟烃和氢氟烃被认为是全球变暖的原因。
Hydrochlorofluorocarbons and hydrofluorocarbons are regarded as contributors to global warming.
单侧微注射氟西泮可降低大鼠平均膈肌活动。
Unilateral microinjection of flurazepam in nucleus tractus so-litarius (NTS) depressed the average phrenic activity.
氟烷基因的遗传与孟德尔的分离定律是一致的。
The inheritance of the halothane gene was shown to be in agreement with Mendel's law of segregation.
利用软件进行三氟甲烷灭火系统模拟方法的研究。
Study the simulating method of trifluoromethane fire extinguishing system by a software.
这一新发明的杀虫剂中包含氯虫苯甲酰胺和氟铃脲。
The new invention relates to a rynaxypyr and hexaflumuron insecticidal composition.
运用专业冷光美白技术治疗四环素牙、氟斑牙、染色牙。
Use professional cold light to whiten and treat acheomycin teeth, dental fluorosis, teeth staining.
质子交换膜燃料电池采用全氟磺酸固体聚合物膜为电解质。
Proton exchange membrane fuel cells use a perfluorosulfonic solid polymer film as electrolyte.
氟维司群预处理可能部分抑制这种由 EGF 介导的运动。
This EGF-mediated motility could be partly inhibited by fulvestrant pretreatment.
详细研究了氟代苯基硼酸和多芳基硼酸的合成及其工艺改进。
The synthesis of fluoro-substituted phenylboronic acid, and multiarylboronic acid and their process improvement were studied in detail.
测定氟虫胺饵剂用于公园和公共绿地等对红火蚁的灭治效果。
Test the efficacy of sulfluramid bait against Solenopsis invicta in gardens and common greenbelt.
另一种杀虫剂是布洛芬,噻虫嗪,氟虫腈,噻虫啉,地诺呋喃等。
The other insecticide is ibuprofen, thiamethoxam, fipronil, thiacloprid, dinotefuran, and the like.
将消费品与杜邦材料一起使用不会导致全氟辛酸(PFOA)的定量暴露。
The use of consumer articles with DuPont materials would not result in quantifiable exposure to perfluorooctanoic acid (PFOA).
本文描述了用毛细管气相色谱对0.8%四氟菊酯驱蚊药液的定量分析方法。
This paper describes a capillary column gas chromatography method for quantitative analysis of an 0.8 % solution of transfluthrin repellent.
2,3-二氯-5-三氟甲基吡啶是杀虫剂氯氟脲类合成农药的关键中间体。
2,3-Dichloro-5-trifluoromethylpridine is a key intermediate of synthesis pesticides of insecticide chlorfluazuron.
我们分别采用离子色谱法和氟离子选择电极法对茶叶中氟化物的含量进行测定。
We tested the quantity of fluoride in tea leaves by separately using fluorinion selective electrode and the ion chromatographys.
目的是探讨外排泵在嗜麦芽窄食单胞菌中对氟喹诺酮类药物的耐药性中的作用。
The objective is to explore the role of efflux pump in drug resistance to fluoroquinolones in Stenotrophomonas maltophilia.
法国制药公司赛诺菲-安万特也在就一种口服药物特立氟胺开展大型临床试验。
France's Sanofi-Aventis is carrying out large clinical trials of an oral drug called teriflunomide.
牙膏和漱口水是氟的良好来源。
Toothpastes and mouthwashes are good sources of fluoride.
每个人需要每天用含氟牙膏。
Everyone should brush with a fluoride toothpaste every day.
氟是一种自然形成的矿物质。
Fluoride is a naturally occurring mineral.
它是铝、硅和氟的化合物。
It is a compound of aluminum, silica, and fluorine.
使用含氟牙膏和令你口感舒服的软毛牙刷。
Use a fluoride toothpaste and a soft-bristled toothbrush that fits your mouth comfortably.