The necessary material of 2 - ( 2 - methoethyl ) acetaldehyde diethyl acetal was synthesized in addition.另外还合成了必需原料 2- ( 2- 甲氧基乙氧基 ) 乙醛二乙醇缩醛.Butyraldehyde 1,2 propanediol acetal was synthesized by using stannous chloride...
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 stannous chloride as catalyst.以非质子...
重点探讨了小眼丛式井井眼轨迹控制问题.The problems of hole trajectory control in cluster slim holes are studied emphatically in this paper.通过与常规井眼对比, 评价了小眼井钻井技术经济效益.By comparing with normal well bore, the economic efficiency of slim hole d...
Murder is unique in that it abolishes the party it injures.谋杀是独特的,因为它完全破坏了受害人.Fanya Kaplan , an assassin , shoots and seriously injures Bolshevik leader Vladimir Lenin.1918年的今天, 芬雅·卡普蓝向布尔什维克领导人弗拉基米尔·列宁连射三枪,令列宁身负重伤.And if...
Biologists need to compare xerophyte and hydrophyte生物学家需要对比旱生植物和水生植物。Hydrophyte A plant found growing in water or in extremely wet areas.水生植物:是生长在水中或是极端潮湿的环境中的植物.A new type of ecological floating bed was developed that c...
Get several written quotations and check exactly what's included in the cost.要几份书面报价,仔细查对费用中包含的内容.The insurance company requires three quotations for repairs to the car.保险公司要修理这辆汽车的三家修理厂的报价单.These quotations cannot ...
将一张黑白底片冲印到彩色相纸上会产生相似的单色效果。Printing a black-and-white negative on to colour paper produces a similar monochrome effect.一般来说，单色的地毯使房间显得更宽敞。In general, a plain carpet makes a room look bigger.此材料必须对该激光器的单色辐射敏感.The material ...