Polyether diol mainly adopts polytetramethylene ether glycol ( PTMEG ).聚醚二醇主要采用聚四氢呋喃醚二醇 ( PTMEG ).Polyhexamethylene adipate diol and Polyurethane aquocmulsion based on the polyester are prepared.以己二酸、己二醇为原料合成聚己二酸己二醇酯二醇,并...
Her work involved more than administration of first aid to the wounded.她的工作不仅是对伤者的急救.We all know first aid.我们都会急救.Always keep a first - aid kit handy .手边要经常有个 急救箱....