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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

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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

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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

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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.

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听力作业2In this section, you will hear a long conversation. At the end of the conversation, you‘ll hear four questions. Both the conversation 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).What’s the decision of the woman’s boss?

A. He decided to hand out the advertisement on the street.
B. He decided to advertise his business online.
C. He decided to put the advertisement on newspapers.
D. He decided to put the advertisement on the signpost.

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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

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