Experts are concerned that more women _____.
A. are obese
B. binge drinking
C. has taken place
D. is dismal
E. are getting healthier
F. seem to be smoking less
G. are dying of breast cancer
查看答案
The silver lining among the bad news is women _____.
A. are obese
B. binge drinking
C. has taken place
D. is dismal
E. are getting healthier
F. seem to be smoking less
G. are dying of breast cancer
苯环上羟基对拟肾上腺素药物活性的影响（ ）
A. 3,4-二羟基化合物活性最强
B. 3-羟基化合物活性最强
C. 4-羟基化合物活性最强
D. 无羟基化合物活性最强
下列关于胺基上取代基对受体选择性的影响的说法正确的是（ ）
A. 烃基增大对α受体的选择性增强
B. 烃基增大对β受体的选择性增强
C. 烃基增大对α和β受体的选择性增强
D. 烃基增大对α和β受体的选择性不变
在拟肾上腺素药物结构的α位引入甲基，下列说法错误的是（ ）
A. α碳原子成为手性中心
B. 代谢缓慢，作用时间延长
C. 为苯异丙胺类
D. 中枢兴奋作用减弱
微信支付 
支付宝支付