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 ...

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...

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

trade的近义词有：business, commerce, trade, bargain, deal,profession, job, occupation, trade, vocation, career, work, employment。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...

n.小型装饰桌巾( doily的名词复数 )...

melaena的音标：melaena的英式发音音标为：[mɪ'lɪ(:)nə]melaena的美式发音音标为：[mɪ'lɪ()nə]...

anergic的音标：anergic的英式发音音标为：['ænədʒɪk]anergic的美式发音音标为：['ænədʒɪk]...

“元帅”的英语可以翻译为：marshal，supreme commander ...

curtail的现在完成时为：curtailed...

Today, KaKa is feeling better and he wants something to eat.今天, 卡卡已经好些了,他想吃点东西.KaKa's Chinese friend, Ruan Xiancheng came to KaKa's school.卡卡的中国朋友, 阮先铖来到了卡卡的学校.KaKa's Chinese friend left his school ten day...

n.不充分，不适当，不完全，[医]官能不足，机能不全，不十分...

bonspiel的音标：bonspiel的英式发音音标为：[bəns'pi:l]bonspiel的美式发音音标为：[bəns'pil]...

“谋求”的拼音为：móu qiú...

This pyjamas has many repairs.这件睡衣有许多修补过的地方.It also visibly reduces scar tissue and repairs and regenerates connective tissue.它也能明显减少疤痕并且使结缔组织再生.Repairs and improvements can lead to higher rental rates.修缮后可以提高租价。The road...

The barn went to wrack and ruin after the farmer moved.那农夫搬走之后,谷仓就废弃了.The wrack of the city was still hot from the fire.这城市的残骸,仍因火灾还是热的.black wrack墨角藻The wrack had begun to stink as it rotted in the sun.海草残骸在阳光下腐烂,开始变臭了....

The Daily Mail has the headline "The Voice of Conscience"《每日邮报》的头版标题为“良知的声音”。Goods may be sent by surface mail or airmail.货物可通过平寄或空运发送。An e-mail is already circulating amongst news staff calling for voluntary redundancie...

n.混合，掺和，混合物，附加剂...

不过，他最宝贵的时光将在自己的农场里平静地度过。His most prized time, though, will be spent quietly on his farm.“请原谅我礼数不周，”她平静地说。“我忘了自我介绍了。”"Forgive my manners," she said calmly. "I neglected to introduce myself."“玛丽·安还好么？”——“她很好，”她平静地说。"Is Mar...