氟化

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？

After the diazotization, a mixture of 2,3,5-trichloropyridine and 3, 5- dichloropyridine-2-ketone was got as a result of Sandmeyer reaction.

收率达84.7%。接着，我们以制得的2，3，5-三氯吡啶为合成2，3-二氟-5-氯吡啶的原料，用NMP为溶剂，加入KF和CsF的混合氟化剂，高温下反应合成了2，3-二氟-5-氯吡啶。

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。

This dissertation is involved in systematical study of the effects and mechanism of microwave by some factors of heat resources, fluorinating agents, solvents, catalysts, by-products and kinetics, etc.

从加热源、氟化剂、溶剂、催化剂、副产物及宏观动力学等方面系统研究了微波对卤素交换氟化反应的影响及其机理。

PTFE slurry in HNO〓 was used as fluorinating reagent to convert the silica matrix into high-volatile fluoride, which was subsequently evaporated by selective vaporization prior to the atomization of analytes.

首次报道了以PTFE为氟化剂，通过高温氟化反应和选择性蒸发原位分离基体硅的新方法。

Summarize: XGN15-12 is a new metal-enclosed switchgear which whole air-insulated is assembly composed with SF6 loading switch as the main switch ,suitable for auto-electric-power distribution , both compacted and extensible metal-enclosed switch equipments.

XGN15-12型户内交流高压六氟化硫环网开关设备是新一代以六氟化硫负荷开关作为主开关而整柜采用空气绝缘的，适用于配电自动化的、既紧凑又可扩充的金属封闭开关设备。

The preparation of the low expansion graphite intercalated compound and the selection or development of the catalyser were involved in the research.

在国内外首次研究成功以无硫低倍膨胀石墨层间物为原料合成氟化膨胀石墨和低温催化合成氟化石墨新技术。

In order to reduce the production cost of aluminum fluoride by wet process ,and to use the local mineral resources,hydrofluoric acid,sulfuric acid and kaolinite were used as raw materials to produce aluminum fluoride by wet process .

为了降低湿法氟化铝的生产成本，同时利用本地的矿产资源，利用氢氟酸、硫酸、高岭土为原料生产湿法氟化铝。

Silicon oxide/Fluorinated amorphous carbon/Silicon oxide multiple-layered films and one-layered Fluorinated amorphous carbon films were prepared using Microwave electron cyclotron chemical vapor deposition reactor with SiH4, O2, CHF3 and CH4 as source gas and were annealed in nitrogen ambience in order to investigate their thermal stability.

食用80％Ar稀释的SiH4，O2，CHF3和CH4作为前驱气体，利用微波电子回旋共振等离子体化学气相沉积方法制备了氧化硅／氟化非晶碳膜／氧化硅(SiO_x／a-C：F／SiO_x)多层膜与单层的氟化非晶碳膜，并在N_2氛围退火处理中考察其热稳定性。

Articles made of tin or tin plate.

二氟化锡；氟化亚锡

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐