氟

With the coordinated interacton of the abrasive particles in dentifrice, can it abrade or corrode dental restorations made from titanium and change their luster and color so as to influence their appearance and long-term use.

含氟牙膏中一般含有氟化钠或单氟磷酸钠，pH值低于7，在摩擦剂的协同作用下是否对口腔中钛制修复体有磨损和腐蚀作用，使其发生失泽和变色，以致影响它的美观和长期使用？

Study on the phosphorate minerals assemblage shows that strongly developed anatexis of the area is responsible the occurrence of wagnerite and its coexistence with apatite, and both present as rock-forming minerals. The volatiles F, P and components Ca, Mg determine the formation of wagnerite, while the P-T condition affects the variation of wagnerite polytypes.

通过磷酸盐矿物组合的岩石学研究得知强烈发育的深熔作用导致氟磷镁石与磷灰石共生并以造岩矿物出现，挥发分F、P以及Ca、Mg等成分因素决定氟磷镁石的出现与否、温压条件控制氟磷镁石的多型变化。

The latter is chlorinated in the side chains under free-radical conditions to give 2,4-dichloro-5-fluoro-3-dichloromethyl-1-trichloromethylbenzene. The latter is hydrolysed via 2,4-dichloro-5-fluoro-3-dichloromethylbenzoic acid, which can be isolated if necessary, to give 2,4-dichloro-5-fluoro-3-formyl-benzoic acid, the aldehyde group of which is reacted to give 2,4-dichloro-5-fluoro-3-N-hydroxyiminomethyl-benzoic acid, from which, with simultaneous conversion of the carboxyl group into the chlorocarbonyl group, water is eliminated using an acid chloride to give the nitrile 2,4-dichloro-3-cyano-5-fluoro-benzoyl chloride.

随后，在游离基条件下进行侧链的氯化，得到2，4-二氯-5-氟-3-二氯甲基-1-三氯甲基苯、后者被水解，经过2，4-二氯-5-氟-3-二氯甲基苯甲酸(如果需要此化合物可以分离)，得到2，4-二氯-5-氟-3-甲酰苯甲酸，将其醛基反应，得到2，4-二氯-5-氟-3-N-羟基亚氨基甲基苯甲酸，用酰氯从其中除去水，同时将羧基转化为碳酰氯，得到一种腈，即2，4-二氯-3-氰基-5-氯-苯甲酰氯。

Based on the precipitation reaction principle of defluorination in wet-process phosphoric acid production,sodium carbonate and diatomite have been experimented to defluorine from phosphoric acid with different conditions.

基于湿法磷酸沉淀法脱氟工艺的反应原理，以碳酸钠为脱氟剂，硅藻土为助脱氟剂，研究了不同的碳酸钠和硅藻土用量、作用时间、作用温度条件下的脱氟效果。

Many kinds of treatment are used for fluoride removal. Conventional methods including coagulant sedimentation, active alumina adsorption, bone char adsorption are not suitable for rural areas owing to operation and management. Membrane methods for defluoridation, such as electric infiltration and reverse osmosis, have the advantage of convenient application, simple operation and good adaptability.

用于饮用水除氟的水处理技术有多种，常规除氟技术的有混凝沉淀法、活性氧化铝吸附法、骨炭吸附法，常规除氟技术由于受技术操作、管理、运行等要求影响，不宜在农村使用，膜法除氟技术，如电渗析、反渗透等应用方便，操作简单，适宜性强。

In this thesis, synthesis of fluoroalkyl-containing heterocycles from rhodium acetate catalyzed reactions of fluorinated α-diazo-β-ketoestes were studied in detail.

本论文系统地研究了氟烷基和二氟亚甲基取代的α-重氮羰基化合物的合成及其在醋酸铑催化下的反应。由此合成了一系列氟烷基和少氟取代的杂环化合物。

Also produce 1000 tons inorgnic fluorides series products per year, They are of good quality and mainly sold abroad.

现有年产3000吨三氟甲苯、8000吨对氯三氟甲苯、5000吨4-氯-3，5-二硝基三氟甲苯和年产1000吨无机氟化盐规模的生产能力，产品生产稳定，质量上乘，并远销国内外。

Enterprise specializing in pumps, valves, pipes, pipe fittings, corrosion-resistant equipment, mechanical equipment, steel-lined plastic·úmaterials and various types of product development, design, production and sales of main products have fluoroplastics pump, steel-lined PTFE pump , liquid pumps, self-priming pump, magnetic pump, centrifugal pump, stainless steel pump, fluorine plastic lined plug valves, butterfly valve, ball valve, valve, check valve, valve, gate valve, pipe fittings and steel equipment ten Level of stress, some more than 1120 kinds of model specifications.

企业专门从事水泵、阀门、管道、管件、防腐设备、机械设备、钢衬氟塑料及全塑各类产品的研发、设计、生产和销售，主要产品有氟塑料泵、钢衬四氟泵、液下泵、自吸泵、磁力泵、离心泵、不锈钢泵，氟塑料衬里旋塞阀、蝶阀、球阀、截止阀、止回阀、隔膜阀、闸阀、管道件及钢塑设备十个压力等级，约1120多种型号、规格。

TOP FLUOROCHEM CO.,LTD provides world class products based on tetrafluoroethylene and has staff of internationally known experts in chemical engineering, fluorine chemistry and textile chemistry. Our products are manufactured with the permission and supervision of three U.S.corporations: DFL,FluoroScience, and Innovative Consumer Polymers.

太普氟化工贸易有限公司拥有在国际化工、氟化学和纺织化学领域的知名专家，提供以四氟乙烯单体为基础原料的高质量氟产品，公司产品是在DFL， Fluoro Science，和 Innovation Consumer Polymers三家美国公司的许可和监督下生产制造。

Broken down as follows according to material pipeline: First, tetrafluoroethylene and composite pipe: lining for tetrafluoroethylene hose, weaving between fiber entanglement for enhanced layer, the outer layer is a protective layer, good flexibility, anti-oil permeability (0.2mg / sq m), temperature reached -60 C - 200 C, resistant to acid, alkali, solvent corrosion, voltage 0.5 - 50MPa, and processing of "Teflon""PTFE bellows" and a variety of high-pressure composite pipe.

一、四氟乙烯及复合管：内层为四氟乙烯软管，中间为纤维编织缠绕增强层，外层是防护层，柔韧性好，抗油渗透性（0.2mg/平方米，耐温达-60°C--200°C，耐强酸、碱、溶剂腐蚀，耐压0.5--50MPa，并加工&铁氟龙&&四氟波纹管&及各种高压复合管。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。