我们用螺旋钻在冰上钻洞。We make a hole in the ice with an auger.螺旋钻在一刻不停地挥舞着.Drills were set to work without intermission.'螺旋'.''钻,木螺钻一种用于在木头或冰上''.'钻孔'. ''的工具.A tool for boring holes...
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...