查询词典 ether

In this paper, the different volume ratio additives'influences on the economy of different fuels as well as the characteristics of combustion and emission have been investigated employing the knowledge about combustion dynamics and chemical reaction dynamics on the base of the gasoline additives application actuality in engine. Dimethyl Carbonate, Diisopropyl Ether and Ditert-Butyl Peroxide are selected as gasoline additives to explore the potential and promotable additives by engine tests in different base fuels.

本文根据汽油添加剂的应用现状并结合内燃机燃烧学、化学反应动力学等知识，选择用碳酸二甲酯、二异丙醚、二叔丁基过氧化物作为汽油添加剂，通过不同基础燃油的发动机台架试验，研究不同添加体积比的添加剂对不同燃油经济性、燃烧特性、排放特性的影响，以探求潜在的可推广使用的汽油添加剂。

Ethel ether, propanone and methyl alcohol were used for the separation of sample, BRUKER VECTOR33 FTIR spectrometer was used for test. The infrared spectrums are analyzed, the qualitative and quantitative analyses of the components are shown and the function of every composition is explained.

分别采用乙醚、丙酮、甲醇等有机溶剂对样品进行分离处理，通过BRUKER VECTOR33傅里叶变换红外光谱仪进行测试，对分离后各组份的红外光谱特征进行解析，给出样品的定性和定量分析结果；对各组份在清洗剂产品中的功能进行了分析说明。

I eat a long-acting contraceptive (levonorgestrel propargyl ether estrogen tablets) a year, on the 17th each month to eat, on the 26th to menstruation, did not have this month.

吃长效避孕药后多久可以怀孕？我吃长效避孕药一年了，每月17号吃，26号来月经，本月没吃。

Results By using two-phase solvent systems composed of petroleum ether-ethylacetate-methanol-water (22:25:23:17) at the flow rate of 2.0 mL/min, with rotating speed of 800 r/min, and at temperature of 25℃, the yield of d1-tetrahydropalmatine and of protopine purified from the total alkaloids being 16.9% and 14.7%, with purity of 99.3% and 98.8% respectively can be reached.

结果 石油醚－乙酸乙酯－甲醇－水(22：25：23：17)为溶剂体系，流速为2.0 mL/min，仪器转速800 r/min，温度25℃，从延胡索总碱中可一步纯化得到原阿片碱和延胡索乙素，得率分别为16.9%和14.7%，纯度分别为99.3%和98.8%。

All companies in Thailand in early 2002 that a 'high-tech world, as China's first China Aerospace Group / Houston hospital / yellow rope lead the entire group radiation center Thai Plant, in full production, pyrocondensation Casing has approved UL / cUL International Security Certification, the industry took the lead at home and abroad by SGS comprehensive test: lead Pb, Cd Cd, mercury Hg, hexavalent chromium Cr, PBB PBBS, PBBs ether PBDES.

全泰公司于2002年初在著称'世界高科技、中国第一照的中国航天集团/中国火箭院/中国黄缆集团辐照中心筹建全泰二厂，已全面投产，热缩套管已通过UL/cUL国际安规认证，国内外同行业率先全面通过SGS测试：铅Pb、镉Cd、汞Hg、六价铬Cr、多溴联苯PBBS、多溴联苯醚PBDES。

In this paper, the synthesis of polyamide acid resin, with 4, 4′-diam-inodiphenyl ether and pyromellitic dianhyride as monomers and dimethylacetamide as solvent, is reported; the preparation of polyimide fiber from PAA resin by dry- spinning method is described; and the effects of various factors of operating conditions upon the mechanical properties of the fiber is discussed.

本文报导了用4，4′—二氨基二苯醚与苯均四酸酐作单体，在N，N′—二甲基乙酰胺溶剂中合成聚酰胺酸树脂，以及用该树脂经干纺法制备纤维和制备过程中各项参数对纤维力学性能的影响。

Ultra-thin freestanding polyimide films of 100 nm thickness were formed by sequential evaporation of 4,4'-diaminodiphenyl ether and pyromellitic dianhydride precursor monomers followed by a thermal treatment of 150 ℃ 1 h and 350 ℃ 2 h.

采用分层蒸镀法，在玻璃基片上依次蒸镀二氨基二苯醚和均苯四甲酸二酐两种单体，然后在空气环境中对样品进行不同温度和时间的热亚胺化处理，使二者在交界面上反应生成聚酰亚胺。

A high temperature resistant polyimide adhesive agent was synthesized by pyromellitic dianhydride and 4,4-diamino diphenyl ether in order for the self-adhesion of aero dynamo magnetic steel plates.

为解决国内无法生产航空电机用自粘磁钢片的难题，用均苯四甲酸二酐和二氨基二苯醚合成一种耐高温聚酰亚胺粘合剂，配合相应的处理工艺，制成一种耐250℃的自粘性磁钢片，成功应用于航空、航天等高科技领域。

Thus it is presented an effective RNA extraction method based on the nuclease adsorbent macaloid, poly vinyl pyrrolidone, and high concentration of KAc and ethylene glycol monobutyl ether, which has successfully extracted high-quality RNA from many materials difficult to RNA isolation, such as RNase-rich rabbit liver, plant and microbial tissues rich in polysaccharides, lipids and polyphenol compounds.

现利用硅藻土对RNase的吸附性，结合PVP、高盐及乙二醇丁醚沉淀等处理，建立了一种广泛适用的RNA提取方法。在富含多糖的玉米胚乳，富含RNase的动物肝脏，多酚多油脂的银杏、麻疯树以及木霉、酵母等10多种RNA提取困难的动、植物与微生物材料中都提取出完整性好，得率高的RNA。

Then recrystallize the thick product with the petroleum ether, the end product obtains its melting point after infrared lamp drying with the melting point detector and compares with the pure Diphenyl carbinol.

粗产物用石油醚重结晶，终产品经红外灯烘干后用熔点测定仪得到其熔点，并与纯品二苯甲醇比较。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。