Aspirin is synthesized through O - acylating reaction from acid and anhydride acid with anhydrous carbonate as catalyst.以水杨酸和乙酸酐为原料,采用无水碳酸钠作为催化剂经O - 酰化反应合成了阿司匹林.In 2002, we develop Photo - catalyst & electronic Ionizer A...
He wrenched off his sneakers.他使劲儿脱下运动鞋。He wore an outlandish outfit of pink pants and green sneakers.他穿了一套稀奇古怪的衣装, 粉红色裤子、绿色旅游鞋。General field MBT sneakers are more sensible choice.一般的野外MBT运动鞋是较为明智的选择.Robert Redford is bac...
我从他那里学到了许多关于经营乐队方面的东西.I learned a lot from him about how to run a band.她在世界各地跳过舞、编过舞、讲过学、也教过书。She has danced, choreographed, lectured and taught all over the world.你在学生时代学到什么东西了吗？Did you learn anything in your day, as a ...