以非质子酸氯化亚锡为催化剂,催化合成了丁醛-1,2-丙二醇缩醛.Butyraldehyde 1,2 proparediol acetal was synthesized by using stannous chloride as catalyst.以非质子酸氯化亚锡为催化剂,催化合成了丁醛-1,2-丙二醇缩醛.Butyraldehyde 1,2 propanediol acetal was synthesized by using st...
讲硬度, 金刚钻是独一无二的.With regard to hardness, the diamond is in a class by itself.金刚钻闪出灿烂的光辉.The diamond sparkles with brilliant light.金刚钻是一种宝石.A diamond is a precious stone....
Unfortunately, Grandma always seems to awaken at awkward moments.不幸的是，奶奶好像总是醒来的不是时候。The British never awaken to peril until it is almost too late.英国人从来不懂得防患于未然。Old people awaken early in the morning.老年人早晨醒得早....
目的以对羟基苯甲醛为底物,通过微生物的转化作用生物合成天麻素.Aim To synthesize gastrodin via biotransformation of microorganism using p - hydroxybenzaldehyde as substrate.方法: 以甲醇为溶剂,以对羟基苯乙酮和溴为原料制备了α - 溴-4-苄氧苯基苯乙酮.Methods: α - Bromo - 4 - benzyloxy ac...
The Minnesota Vikings signed Herschel Walker from the Dallas Cowboys.明尼苏达维京人队签下了来自达拉斯牛仔队的赫舍尔·沃克。The area was colonized by the Vikings.这一地区曾沦为维京人的殖民地。Early in the eleventh century the whole of England was again conquered ...
沃里克队在排名中蹿升至第3名，落后领先的埃塞克斯队31分。Warwicks leap to third in the table, 31 points behind leaders Essex.那是沃里克路，就在伯爵宫地铁站对面。That's Warwick Road, just opposite Earls Court tube station.约翰尼·沃里克在亚拉巴马州有个养猪场。Johnny Warrick has a ...
这个队伍的丰富经验和表现出来的实力是众所公认的。Few would argue that this team has experience and proven ability.亨特先生及他率领的管理小组加入了州长们的队伍。The governors were joined by Mr Hunter and his management team.门口的队伍绕了大楼一圈。The queues at the door wound arou...