acetals是什么意思

The hydroxyl groups can be changed into esters , ethers , acetals and ketals, etc.最常用的羟基保护基可归纳为三类:酯类 、 醚类和缩醛或缩酮类.Eight acetals ( Ketals ) were synthesized under the optimal conditions.在最佳条件下,合成了八个缩醛 ( 酮 ) 化合物.The yields ...

acetals的音标：acetals的英式发音音标为：['eɪsɪtəlz]acetals的美式发音音标为：['eɪsɪtəlz]...

The yields of other cyclic acetals were between 62.并在此条件下合成了多种环缩醛,收率62.Eight acetals ( Ketals ) were synthesized under the optimal conditions.在最佳条件下,合成了八个缩醛 ( 酮 ) 化合物.The hydroxyl groups can be changed into esters , ethe...

The nuclei of endosperm are amitosis and its division is not synchronous.胚乳核为无丝分裂,分裂不同步....

向杂岩体方向靠近,在东德兰士瓦,曾报导有直闪石.Close in towards the complex anthophyllite has been reported from the Eastern Transvaal....

bystander的复数形式为：bystanders...

gild的第三人称单数（三单）为：gilds...

[中英文摘要]目的探讨鼻内镜在慢性泪囊炎中的应用价值.Objective To explore the applied value of nasal endoscope in chronic dacryocystitis.目的观察综合疗法治疗先天性泪囊炎的疗效.Objective To observe the effect of combined therapy for congenital dacryocystitis.结论鼻内窥镜下...

詹姆斯敦, 虽然真的是个很好的港口, 但太过沼泽化, 被蚊虫寄生, 且缺乏新鲜的水源.Jamestown , though it possessed a good harbor, was swampy, infested with mosquitoes, and lacked freshwater sources.并依此分析了三峡工程对土壤潜育化沼泽化的影响.The effect of the Three Gorge project o...

“射角”的拼音为：shè jiǎo...

keystrokes的音标：...

amoebiasis的音标：amoebiasis的英式发音音标为：[ə'mi:bɪəsɪs]amoebiasis的美式发音音标为：[ə'mibɪrsɪs]...

commerce的近义词有：business, commerce, trade, bargain, deal。下面这些名词均含"贸易，交易"的含义：business：指包括售货、购货、换货在内的综合商业活动，方式可以是批发或零售。 commerce：多指大规模的买卖或易货关系。trade：普通用词，含义广。既可指某种具体的商业又可指广泛的贸易。bargain：多指买卖双方通过谈判、协商就商品质量、数量、价格等项达成协议所成的生意。dea...

subordinating的音标：subordinating的英式发音音标为：[sə'bɔ:dɪneɪtɪŋ]subordinating的美式发音音标为：[sə'bɔdɪneɪtɪŋ]...

Lay them on their side and ensure the airway is unobstructed.让他们侧躺着,并确保呼吸道畅通.There is a purple airway in London Airport.伦敦机场里有一条皇家专用飞机跑道.Suspect complete airway obstruction if victim cannot speak, and has a weak cough.如果...

“线”的英语可以翻译为：thread，string，[数]line，wire...

Add water and mix with a knife to a doughy consistency.加水用刀搅拌成黏稠状。Dilute the paint with water until it is the consistency of milk.用水把涂料稀释到牛奶般的稠度。He scores goals with remark-able consistency.他的进球一气呵成。...

n.嗜人生物（指蚊子等喜人的或经常在人周围活动的生物）...