A novel catalyst system FeCl2·4H2O/hexamethylphosphoric triamide (HMPA) induced ATRP of MMA in combination with ethyl 2-bromoisobutyrate (EBiB) to give the polymers with controlled molecular weights and narrow molecular weight distributions (MWDs) (Mw/Mn) < 1.20. With the use of benzyl ...
C. 14MW D. 6MW 查看完整题目与答案 有学者认为“解负令”是梭伦改革的核心,其原因在于( ) A. 剥夺了氏族贵族的特权 B. 巩固了雅典的公民群体 C. 释放了所有和战俘 D. 满足了平民的政治要求 查看完整题目与答案 已知X、Y为控制人类性别的一对同源染色体。女性为XX,男性为XY。有2%～4%的...