Phenyl ( or polyphenyl ) substituted epoxides serve as excellent precursors to phenyl ( or diphenyl ) carbenes.某些苯代 ( 或多苯 ) 环氧乙烷是制取带苯环 ( 或二苯 ) 碳烯的极好原料.The epoxides were obtained with up to 90 % yields in the reaction sys...
A load lock system minimizes this problem.使用装卸密封系统能把这个问题减小到最小限度.The braking system incorporates the latest four - channel anti - lock system .制动系统融合了最新的4通道 防抱死系统.This paper introduces an auto - alarming electronic cipher...