聚羟基乙酸的经典制备方法主要有两种:直接缩合聚合法和乙交酯开环聚合法. There are two means available for the preparation of PGA - synthesis polymerization and ring - opening polymerization.
Des, 18, was working as a club doorman.德，18岁，是一家俱乐部的门卫。The police came back and cross-questioned Des again.警察回来重新盘问德斯。There had been something in Des'sfirst statement.德斯最初的陈述有些道理。...
The new e-books will include a host of Rough Guide titles.新电子书将包括大量的简明指南。He left a host of other riders trailing in his slipstream.他把其他的摩托车手甩在身后。A host of problems may delay the opening of the Channel Tunnel.可能推迟英吉利海峡隧道开...
She is expected to be subservient to her uncle.她被要求对叔叔恭敬顺从。You don't hurt me, Uncle Micah, but you destroy the future of these is lands.你伤不了我的心, 弥迦姑夫, 但是你断送了群岛的前途.Her uncle spend two years on a warship as a yeoman.她...