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.
Anglicanism is the form of church life characteristic of the Anglican Communion.英国国教是英国国教教会所特有的教会生活方式.Anglicanism is the established religion in England.英国圣公会是英国国教.Anglicanism is the ______ religion in England.英国圣公教是英国国教...
The songs he recorded were written by a small coterie of dedicated writers.他录制的这些歌是由几名酷爱音乐的作曲家谱写的。The verses were copied out , handed about , sneered at, admired, passed from coterie to coterie.这些诗, 有人抄录,有人传阅, 有人鄙夷, 也有人赞...
教师不悦地怒视那个喧闹的男孩.The teacher scowled at the noisy boy.她看着恋人,故作不悦地撅着嘴.She looked at her lover with a pretentious pout.她不悦地瞟了我一眼.She looked at me rather askance....