金属环

This product use special-purpose materials, bear cooling agent, against oil, grinding wheel froth and iron filings and so on; The guard shield has the traveling schedule long and reduces the small merit; Guard shield's bellower speed may amount to the 200m/minute; In the guard shield any metal parts, have not needed to worry the guard shield works when to present the components to become less crowded, but creates the serious broken link to the machine, has the best security.

该产品使用专用的材料，耐冷却剂、防油、砂轮沫和铁屑等等；护罩具有行程长和压缩小的优点；护罩的风箱速度可达200m/分；护罩内没有任何金属零件，不用担心护罩工作时会出现零件松动而给机器造成严重的破环，具有最佳的安全性。

The acetate bicyclic guanidine as the catalyst is a nonmetallic and nontoxic organic compound; the method has low production cost, simple process operation, no pollution, a high product yield of more than or equal to 95 percent and a high product purity of more than or equal to 98 percent; and a synthesized biodegradable polymer has high biological safety.

催化剂醋酸双环胍为无金属、无毒有机化合物，生产成本低、工艺操作简便、无污染，产品产率高(≥95％)、产品纯度高(≥98％)；所合成的生物降解聚合物具有高度的生物安全性。

The Xray diffraction analysis of the compounds (3) and (4) shows the presence of an intramolecular coordination of oxygen to the tin atom giving rise to a fivemembered ring in which the metal exhibits a distorted trigonal bipyramidal geometry.

并通过X-射线衍射测定了（3）和（4）的晶体结构，其空间群均为P2〓/c，晶胞内分子数Z=4，分子结构是以锡原子为中心金属原子、含分子内O→Sn配位键五员环的扭曲三角双锥结构，碳碳双键的两个氢是顺式构型。

The interaction of these chalcone derivatives, DMAC-CD with transitional metal ions were studied by steady state and time-resolved fluorescence spectral techniques.

利用稳态荧光和时间分辨荧光技术研究了该类查尔酮衍生物以及上述查尔酮修饰的环糊精衍生物与过渡金属离子间的相互作用。

When you use safety belts ,you should check brand and certification, inspect nylon whether it is crackless and with strong thread, whether it is no lack of metal pieces, cracks and corrosion, safety rope should be linked to the connection ring.

每次使用安全带时，应查看标牌及合格证，检查尼龙带有无裂纹，缝线处是否牢靠，金属件有无缺少、裂纹及锈蚀情况，安全绳应挂在连接环上使用。

This polymer catalyst was used in the aerobic oxidation of cyclohexene under mild conditions.

合成了聚苯乙烯担载的酪氨酸水杨醛希夫碱钴配合物，并研究了该高分子金属配合物对分子氧氧化环己烯的催化性能。

The paper reviews the progress of ionic liquids as microwave mediums or catalysts in the fields of organic synthesis, mainly including cyclization, nucleophilic substitution, ring closing metathesis, acylation, rearrangement, polymerization, coupling, oxidation and reduction as well as selective debromination, etc.

本文综述了以离子液体为反应介质或催化剂的微波辅助技术在多种类型有机反应中的研究成果，主要包括了环合反应、亲核取代反应、金属复分解反应、酰化反应、重排反应、聚合反应、偶联反应、氧化还原反应和选择性脱溴反应等。

The paper reviews the progress of ionic liquids as microwave medium or catalyst in the fields of organic synthesis, mainly including cyclization reation, nucleophilic subsitution reaction, metathesis reaction, acylation reation, rearragement reaction, polymerization reaction, coupling reaction, oxidation and reduction reaction as well as selective debromination reaction etc.

本文综述了以离子液体为反应介质或催化剂的微波辅助技术在多种类型有机反应中的研究成果，主要包括了环合反应、亲核取代反应、金属复分解反应、酰化反应、重排反应、聚合反应、偶联反应、氧化还原反应和选择性脱溴反应等。

The intermediate decyl-glycidol ether of Gemini phosphate surfactant was synthesized with decanol and epichlorohydrin in the presence of phase-transfer catalyst; the intermediate decyl digomeric glycol of Gemini phosphate surfactant was prepared by opening ring reaction of decyl glycide ether and glycol in the presence of potassium as catalyst; and the influence of type and dosage of phase-transfer catalysts was studied.

以正癸醇与环氧氯丙烷为原料在相转移催化剂存在的条件下合成Gemini磷酸酯表面活性剂的中间体I-正癸基缩水甘油醚，讨论催化剂种类及用量对反应的影响；以乙二醇和正癸基缩水甘油醚为原料，金属钾为催化剂合成Gemini磷酸酯表面活性剂的中间体Ⅱ-正癸基低聚二醇，讨论催化剂种类与用量对反应的影响；以P2O5与正癸基低聚二醇为原料合成Gemini磷酸酯表面活性剂，讨论投料比、反应温度和反应时间等因素对反应的影响。

Aromatic dinitro compounds were reduced irrespective of the presence or absence of β-CD in sodium hydroxide solution, which revealed particularity of aromatic dinitro compounds.These reactions have advantages below over past research results of aromatic nitro compounds:(1) The synthetic method using water as the reaction medium may

这些反应与过去人们对硝基化合物反应的研究结果相比，具有以下优点：(1)反应在水介质中进行，避免使用辅助有机溶剂和金属催化剂，是环境友好的清洁反应，比较符合绿色化学的发展要求；(2)反应中所用的β-环糊精无毒，价廉，易得

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。