discussion on reasons of burning loss, unfixing and drop, wreckage caused by connection between graphite electrode and nipple and suitable solutions

a wing nut is a nut with wings.

蝶形螺母是一种翼状物的螺母。

互联网摘选

the solid dimethyl dially ammonium chloride was synthesized with dimethyl amine and allyl chloride as raw materials by the method of double liquid phases and two steps.

以甲苯为有机相溶剂，二甲胺（水溶液）和烯丙基氯为原料，采用双液相二步法合成了固体二甲基二烯丙基氯化铵。

互联网摘选

study on synthesis of carbamate by carbonylation of dimethyl carbonate and organic amine

碳酸二甲酯与有机胺羰基化合成氨基甲酸酯的研究

互联网摘选

long chain monoalkyl dimethyl tertiary amine, as an important material of surfactant, is widely used in textile industry, petroleum, cosmetic, and other daily chemicals and etc., and cannot be substituted by other chemicals.

长链单烷基二甲基叔胺，是表面活性剂的重要原料，它在纺织、石油、化妆品、日化等行业有着广泛的用途，具有其它化学品不可替代的地位和作用。

互联网摘选

the synthetic technological conditions of dodecyl dimethyl tertiary amine oxide were studied by orthogonal experiments. the optimum synthesis conditions were obtained in the presence of catalyst.

采用正交试验法对十二烷基二甲基氧化胺的合成工艺条件进行了研究，获得了在催化剂存在下的最优合成条件。

互联网摘选

catalyst is one of key issues in the process of amination of fatty alcohol with dimethylamine for preparation of long chain alkyl dimethyl tertiary amine.

脂肪醇在催化剂作用下直接胺化催化反应是目前生产长链烷基二甲基叔胺的主要工艺。该工艺的技术关键之一在于其催化剂。

互联网摘选

long chain monoalkyl dimethyl tertiary amine, with content of 98.5%, can fully satisfy requirements of various customers.

工业化生产的长链单烷基二甲基叔胺产品含量均在98.5%以上，完全可以满足各种不同用户的需求。

互联网摘选

study on the synthesis and application of dodecyl dimethyl tertiary amine oxide

十二烷基二甲基氧化胺的合成及应用研究

互联网摘选

the newly developed catalyst dl-03 for industrial use is able to satisfy the aliphatic alcohol one-step synthesis of dialkyl methyl amine and alkyl dimethyl amine. the scaling-up in a 500 t/ a unit has been successfully done in one time.

开发的DL&03工业催化剂满足了醇一步法制单、双长链烷基叔胺反应，并在500t/a装置上进行放大，一次获得成功。

互联网摘选

in this paper, an easy synthesis method of novel 12-3-12 gemini cationic surfactant were introduced from dodecyl dimethyl amine and epichlorohydrin in the lab. the structures of the product were characterized by the methods of ir and elemental analyzer.

以十二叔胺与环氧氯丙烷为主要原料，在实验室合成12-3-12型Gemini阳离子表面活性剂，终产物用傅立叶红外变换仪和元素分析仪进行定性分析，并对表面活性剂的性能进行了详细讨论。

互联网摘选

finally, gemini cationic surfactants were prepared by reaction of hexadecyl amide propyl dimethyl amine and bis ( 2-hydroxy-3-chloropropyl) alkylamines.

最后以十六酰胺丙基二甲基叔胺和二（2-羟基-3-氯丙基）烷基胺为原料反应制备Gemini阳离子表面活性剂。

互联网摘选

a new method of spectrophotometric determination of trace amount of chromium(ⅵ) with high sensitivity-tetrakis ( 4 dimethyl amine ammonium phenyl) porphyrin

超高灵敏度测定水中痕量铬（Ⅵ）的新方法&四（4-二甲胺苯基）卟啉分光光度法

互联网摘选

comparison between loop reactor and agitating reactor in producing dodecyl dimethyl amine

环路反应装置与搅拌釜装置生产十二烷基二甲基叔胺的比较

互联网摘选

through screening test for the active ingredients it was identified that pd/ c catalyst has good selectivity for the ( reaction) of fatty nitriles with dimethyl amine to prepare alkyl-dimethyl tertiary amines.

通过对催化剂活性组分的筛选，钯/碳（Pd/C）催化剂对脂肪腈与二甲胺反应制备单烷基二甲基叔胺有良好的选择性。

互联网摘选

in this paper, a new chloroform production process by reaction of chlorinated oil with dimethyl amine instead of lime is introduced, in which n, n-dimethyl methanamide is coproduct.

介绍了一种采用二甲胺代替石灰与氯油反应，在生产氯仿的同时联产N，N-二甲基甲酰胺的新工艺。

互联网摘选

the patient was treated symptomatically for his cough, and when last seen, in may 1953, his attacks had ceased.

对病人的咳嗽进行了对症治疗。1953年5月最近一次见到该患者时，疾病的发作已经停止。

互联网摘选

advice to physician: treat symptomatically.

建议医生：处理出现的症状。

互联网摘选

symptomatic therapy was conducted in 16 patients with grade ⅰ or ⅱ complications, which were symptomatically relieved 6 months later.

Ⅰ、Ⅱ级16例观察及对症治疗，半年后症状逐渐减轻。

互联网摘选

has a slender neck and the tall figure of the girls the best short pyramid knitted shawl, whether dating or shopping and bring you a relaxed sense of charming elegance.

正扬织带时尚解析：拥有修长脖颈和高挑身材的女生最适合塔形针织短披肩，无论是约会还是逛街都给你带来轻松迷人的优雅感。

互联网摘选

to test the hypothesis and prediction that transgenic coat protein ( cp) could recoat the uncoated virions, an epitope tag approach was exploited to look for the exchange of coat protein subunits at the 5 ′ end of the challenged virus.

为了验证转基因烟草中表达的外壳蛋白（CP）能够重新包被侵入的烟草花叶病毒（TMV）的假设，利用抗原表位标记的方法观察CP亚单位在病毒5′端的交换。

互联网摘选