醚的

Firstly, Polystyrene-supported benzyl selenide has been prepared from 1% cross-linked polystyrene resin.

一、以1%交联的聚苯乙烯为载体，首次合成了聚苯乙烯负载的苄基硒醚。

Because〓 supported on silica is soluble inmethanol, active center of supported 〓 catalyst is able to elapse. The saltsin which ion semidiameter are larger, are ideal solid acidic catalyst, because of theirhigher activities, insolublilities in methanol.

离子半径较大的负载型磷钨酸盐除具有较高活性外，由于不易溶于极性溶剂，因而催化剂活性稳定性强，是一种理想的固体酸醚化催化剂。

The rubber products made of hydrated silica feature transparency and semitransparency, so it is a special raw material for making light-and multi-colored rubber products such ad high-grade hiking shoes, sports shoes, rubber tapes, tires etc.

用白炭黑制成的橡胶制品有明显的透明、半透明性，尤其适用于浅色、彩色橡胶制品、高级轻便旅游鞋、运动鞋、胶带、轮胎、玻璃胶、粘胶、可再分散型乳胶粉、纤维素醚等行业。

The classes of these compounds included triterpenoid, diterponid, sesquiterpene, steroid, lignan, flavone, coumarin, phenol, and fatty acid.

已鉴定的化合物类型涉及单萜、环烯醚萜、倍半萜、二萜、三萜、木脂素、黄酮、脂肪酸、甾醇、香豆素、酚酸和其它类型的化合物。

36 cases severe cardiac valve replacement whose cardio/thorax were 0.68～0.90 measured by sternite, heart function were Ⅲ～Ⅳ grade, average of left ventricle diastole diameterwas 67±9.2mm. All the patients heart function were improved by strict therapy before operate. Selecting best opportunity for operation, by general anesthesia, moderate hypothermia extracorporeal circulation, perfusing heart by cold stop-beating fluid including hypokalium and blood ,and refusing dopamine to maintain haemodynamics after cardiac resuscitation.

36例重症心脏瓣膜置换术病人，X线胸片心胸比0.68～0.90，心功能Ⅲ～Ⅳ级，左室舒张末径平均67±9.2mm，术前均经过严格改善心功能治疗，选择有利的手术时机，采用以芬太尼为主，咪唑安定、异丙酚、异氟醚等为辅助药的全身麻醉，中度低温体外循环，以高钾含血冷停跳液灌注心脏，心脏复苏后静脉输注多巴胺等维持血流动力学稳定。

The effects of the food additive butylated hydroxyanisole and the antibiotic Norfloxacin on swordtail fish were measured by considering a number of parameters, including glutathione S\|transferase, catalase, 7-ethoxyresorufin-o-dealkylases and malondialdehyde contents.

研究了叔丁基对羟基茴香醚(butylated hydroxyanisole， BHA)和诺氟沙星(norfloxacin， NFLX)对剑尾鱼的急性毒性及其肝脏谷胱甘肽硫转移酶、丙二醛、过氧化氢酶及7-乙氧基异吩恶唑酮-脱乙基酶活性的影响。

Objective Widespread used as gasoline oxygenate additives, methyl t-butyl ether were added to gasoline to enhance the octane number, reduce carbon monoxide in exhausts and to substitute for tetraethyl lead as an anti-knock agent.starting in the winter of 1992, MTBEup to 15wt.

研究目的甲基叔丁基醚(Methyl Tert-Butyl Ether，MTBE)是一种新型的汽油添加剂，主要用来增加汽油辛烷值，提高汽油燃烧效率，减少汽车尾气中一氧化碳等有害物质的排放，并代替四乙基铅用作汽油防爆剂。

Polyurethanes are one of the most important thermoplastic elastomers and have been widely used in medical-device manufacturing as well as in other applications.

摘要聚醚聚氨酯材料具有优良的力学性能和生物相容性，在植入装置和人工器官中得到了广泛的应用。

Result The results showed that its components were quite complex, and 89 organic compounds were identified. There were 72 kinds of oxygen-containing organic compounds which included esters, phenols, aethers, ketones and alcohols in the depolymerization product, small amounts of alkanes, alkenes, arenes, thiophenol and nitrogen-containing organic compounds were also detected, which showed that characteristics of the product with high oxygen content, low nitrogen and sulphur content.

结果］超临界乙醇解聚产物成分十分复杂，GC/MS分析鉴定出89种有机化合物，其中72种为含氧化合物，主要有酯、酚、醚、酮和醇等，还检测出少量烷烃、烯烃、芳烃、苯硫酚和含氮化合物，反映了解聚产物的高含氧量和低含氮硫量的特性。

Using the procedure described in Example 1, boron trifluoride diethyl etherate (1.49 liters, 12.1 moles) was added followed by 1.21 liters (12.1 moles) of borane-dimethyl sulfide at reflux.

用所述的程序例子1 ，硼乙醚（ 1.49升， 12.1痣），然后又说是1.21升（ 12.1痣）的硼-二甲基硫醚在回流。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。