奥沙西泮是地西泮在体内的活性代谢产物,主要是在地西泮的结构上发生了哪种代谢变化A1位去甲基 ;"B3位羟基化;C3位和2位同时羟基化 ;D1位去甲基,2位羟基化;E1位去甲基,3位羟基化
查看答案
关于巴比妥类药物的构效关系,正确的有哪些AC5上的2个取代基的总碳原子数须为4~8;"B巴比妥酸C5上的2个活泼氢均被取代时才有作用;C用硫代替C2位羰基中的氧起效快作用时间短;D酰亚胺2个氮原子上的氢都被取代时起效快作用时间短;EC5上的取代基为烯烃时作用时间长
地西泮的化学结构中所含的母核是A苯并硫氮杂 环;"B1,4−苯二氮 环;C1,3−苯二氮 环;D1,5−苯二氮 环;E1,6−苯二氮 环
为增加药物代谢的稳定性和对受体的亲和力,可在苯二氮 结构几位并入三氮唑环A1,2位;"B3,4位;C4,5位;D1,2位或4,5位;E3,6位
In this section, you will hear 1 passage. At the end of the passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you hear a question, you must choose the best answer from the four choices marked A), B), C) and D).Which is one of the reasons why many organizations fail to set realistic promotional objectives?
A. Managers are not far-sighted enough.
B. Managers are not professional enough.
C. Managers don’t make a thorough investigation.
D. Managers can’t differentiate (区分) between the value of advertising as expenditure and as an investment.