Iso - amyl acetate was synthesized with ammonium ceric sulfate as catalyst neutralized acetic acid and iso - amyl alcohol.以硫酸铈铵为催化剂,乙酸和异 戊 醇为原料,合成乙酸异戊酯.N - amyl aldehyde is a main raw material in the synthesis of methyl ...
针对他们各人不同的需要挑选柔软、软硬适中或者坚硬的床垫。Choose a soft, medium or firm mattress to suit their individual needs.恐龙峡谷中的化石都嵌在坚硬的砂岩中。The fossils at Dinosaur Cove are embedded in hard sandstones.这种物质聚合形成坚硬的塑料。The substance polymerizes to ...
让人联想起大海和船只的氛围an atmosphere redolent of the sea and ships我一闻到这种花香,就联想起我的童年.I always associate the smell of those flowers with my childhood.在孩子的心里,医生总是使他联想到打针与疼痛.The doctor was associated in the child's mind with inje...