能够产生重氮化一偶合反应的药物是
A. 麻黄碱
B. 肾上腺素
C. 异丙基肾上腺素
D. 克仑特罗
对肾上腺素能受体激动剂构效关系叙述正确的是
A. 苯环与侧链氨基相隔2个碳原子时作用较强
B. 苯环上引入羟基时作用强度增加
C. R-构型光学异构体活性较
D. 碳原子上引入甲基毒性降低
E. 侧链氨基上的烃基增大,B受体效应逐渐增强
It is hard to imagine how we could spend a day without ____(electronic) today.
It is____(typically) of Jack to wear formal clothing on such an occasion.