Acetanilide and hexane diacid, potassium hydrogen phthalate could improve PVC crystallinity.乙酰苯胺 、 己二酸和邻苯二甲酸氢钾可以使PVC结晶度增大.Diacid has been got using diethylene glycol as decomposition agent of adduct.采用二甘醇作为加合物的分解剂,得到了二元酸...
There has been a busy start to polling in today's local elections...今天地方选举的投票一开始就人头攒动。Polling is a synchronous mechanism, where devices are serviced in sequence.查询是一种同步机构, 其中的各个设备是依次接受服务的.All polling methods are pot...