氟

This paper has simply summarized on the application and research of the internal processing of fluoric wastewater in recent years, and shows the development of the research on the processing of fluoric wastewater .

本文就近年来国内对含氟废水处理研究及应用概况作了简要综述，可看出含氟废水处理的研究有了较大进展。本文对近几年来国内外对含氟废水的研究进展情况作了简单述评。

Said mineralizing agent is the fluoric alkali-earth metal salts or alkali metal salts (potassium fluoride or calcium fluoride).

其特征是在磷酸钙盐与碳酸钙盐以2∶1比混合物中，加入0.5～3wt％的含氟离子碱土金属或碱金属盐矿化剂，例如氟化钾、氟化钙等。

The research results will be of significance for coal utilization ,fluoridation pollution appreciation and control and can provide prescription for studying new fluorine determination process .

文献[1]中介绍了煤中微量元素氟的各种间接和直接的测定方法的研究进展，并对各种方法的适用性、存在的问题及测定精度进行比较分析和评价，结果表明：高温燃烧水解——氟离子选择电极法测量煤中氟具有操作简单、快

Results: No statistic significant differences between children sex and receiving or non-receiving this benefit factor, however, significant difference were showed at medical providing territories and insured fee factor pConclusions: In the selected children, parent's decision making and territory variance (ex: cities vs. townships gave influence of children to receive teeth fluoridation and incidence rate of caries.

研究结果发现，儿童接受涂氟与否与性别无统计差异；但与就医地区别、全民健保投保金额组别呈现统计上显著差异p依本研究显见涂氟可减少健保牙科医疗利用，确可达到降低医疗费用支出的目的，惟其所减少之健保医疗费用支出，尚未符合公务支付涂氟成本之效益。

Perfluoroguanidine can be prepared by the direct fluorination of dry ammeline with 5% fluorine at about -16℃.

全氟胍可以由于的三聚氰酰胺，用5％的氟在约－16℃直接进行氟化制得。

Perfluoroguanidine can be prepared by the direct fluorination of dry ammeline with 5% fluorine at about-16℃.

全氟胍可以由干的三聚氰酰胺，用5％的氟，在约－16℃直接进行氟化而制得。

Reaction conditions are studied, and the result shows that it is better to adopt mercuric oxide or mercuric fluoride as fluorination catalyst with reaction temperature -20~-10℃.

结果表明，采用氧化汞或氟化汞作氟化催化剂、氟化氢作溶剂较好，适宜的反应温度为－20~-10℃，较长的反应时间(48 h)和增加氟化氢和催化剂的量有利于氟化。2-氯－5-三氯甲基吡啶的转化率和选择率均可达到97%以上。

Fluorine is a necessary element for life of human and animals.

氟是人体和动物的必需元素之一，环境中的氟含量出现异常，往往会通过食物链的作用，引起人畜的氟中毒病症。

Recently several years,the company is engaged in development of Halon substitute,and since year 1997 has successively succeeded in development of 5 kinds substitute,HFC227ea heptafluorpropane,HFC23 fluoroform,HFC236fa hexafluoropropane ,HCFC/A,HCFC/C.

近年来，我公司致力于哈龙替代品的开发，97年以来先后开发成功七氟丙烷、三氟甲烷、六氟丙烷、HCFC/A、HCFC/C五种替代品，形成千吨级生产规模，并已大批量出口海外。

The by-product sodium salt solution can be reacted with fluosilicic acid to produce sodium fluosilicate with lower cost and no three-wastes are produced in the process.

副产物钠盐溶液与氟硅酸反应还可用于制取氟硅酸钠，使氟硅酸钠的生产成本也较低，且无三废产生。

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。