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...
In the cosy consulting room the children are surrounded by familiar objects.在温馨的诊疗室里，孩子们周围摆满了亲切熟悉的东西。Enviros Consulting has a client base of more than 2,000 organisations worldwide.EnvirosConsulting公司在全世界拥有逾2,000家组织机构的客户...