The mass fraction of n - butene in mixed C 4 from catalytic cracking after etherized was approximately 40 %.醚化后的催化裂化混合C4中含有质量分数约为40%的正丁烯,是生产丙烯的优质原料....
Be responsible for DCS system spare parts and documentation management.负责DCS系统备件管理及文档整理工作.Now DCS has widely applied in power control system.目前DCS已广泛应用于电力系统的控制中.Modify and optimize DCS configuration according to process ...
该书曾几次受到作者过多的制约。There are times when the book suffers from excessive authorial control.安妮塔羡慕姐姐不受道德观念的制约，藐视公众舆论。Anita envied her sister's amorality and contempt for public opinion.工会受法律的制约。The trade unions are shackle...