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【单选题】
以下哪个不符合喹诺酮药物的构效关系
A.
1位取代基为环丙基时抗菌活性增强
B.
5位有烷基取代时活性增加
C.
3位羧基和4位酮基是必需的药效团
D.
6位F取代可增强对细胞的通透性
E.
7位哌嗪取代可增强抗菌活性
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参考答案：
举一反三
【单选题】起动往复泵后，不能产生吸排，且吸入真空高度很小，则可能原因是（）。
A.
活塞环密封性能变差
B.
吸入滤器脏堵
C.
吸入油液温度过低
D.
吸入阀未打开
查看完整题目与答案
【单选题】Which word is not similar to "well-known" in meaning?
A.
desirable
B.
noted
C.
famous
D.
renowned
查看完整题目与答案
【多选题】Which of the following word or words are used in the same way of word building with "kid-centered"? A、 ice-cold B、 color-coded C、 world-famous D、 handmade
A.
ice-cold
B.
color-coded
C.
world-famous
D.
handmade
查看完整题目与答案
【单选题】A wonderful example of this is the fashion designer, Vera Wang, who originally studied art history. Over time, Wang paired her studies in art history with her love of fashion and turned it into a pass...
A.
It means a passion for design
B.
It means the whole(整个的） sentence " Over time, Wang paired her studies in art history with her love of fashion and turned it into a passion for design"
查看完整题目与答案
【单选题】具有活血行气,祛风止痛功效的药是:
A.
川芎
B.
郁金
C.
乳香
D.
五灵脂
查看完整题目与答案
【单选题】具有活血行气,祛风止痛功效的药是:
A.
延胡索
B.
川芎
C.
郁金
D.
姜黄
E.
丹参
查看完整题目与答案
【单选题】起动往复泵后,不能产生吸排,且吸入真空高度很小,可能原因是:
A.
活塞环密封性能变差
B.
吸入滤器脏堵
C.
吸入油液温度过低
D.
吸入阀未打开
查看完整题目与答案
【单选题】【单选】起动往复泵后,不能产生吸排,且吸入真空高度很高,可能原因是
A.
活塞环密封性能变差
B.
_吸入滤器滤网有破洞
C.
吸入滤器脏堵
查看完整题目与答案
【单选题】有活血行气,祛风止痛功效的是( )
A.
三七
B.
熟地
C.
川芎
D.
丹参
E.
当归
查看完整题目与答案
【简答题】I'm so glad to read about the changes taking place in your city. It's really good news that you can travel by subway in Xi'an, though there's only three line there. Here in London we have twelve lines...
查看完整题目与答案
相关题目：
【单选题】起动往复泵后，不能产生吸排，且吸入真空高度很小，则可能原因是（）。
A.
活塞环密封性能变差
B.
吸入滤器脏堵
C.
吸入油液温度过低
D.
吸入阀未打开
查看完整题目与答案
【单选题】Which word is not similar to "well-known" in meaning?
A.
desirable
B.
noted
C.
famous
D.
renowned
查看完整题目与答案
【多选题】Which of the following word or words are used in the same way of word building with "kid-centered"? A、 ice-cold B、 color-coded C、 world-famous D、 handmade
A.
ice-cold
B.
color-coded
C.
world-famous
D.
handmade
查看完整题目与答案
【单选题】A wonderful example of this is the fashion designer, Vera Wang, who originally studied art history. Over time, Wang paired her studies in art history with her love of fashion and turned it into a pass...
A.
It means a passion for design
B.
It means the whole(整个的） sentence " Over time, Wang paired her studies in art history with her love of fashion and turned it into a passion for design"
查看完整题目与答案
【单选题】具有活血行气,祛风止痛功效的药是:
A.
川芎
B.
郁金
C.
乳香
D.
五灵脂
查看完整题目与答案
【单选题】具有活血行气,祛风止痛功效的药是:
A.
延胡索
B.
川芎
C.
郁金
D.
姜黄
E.
丹参
查看完整题目与答案
【单选题】起动往复泵后,不能产生吸排,且吸入真空高度很小,可能原因是:
A.
活塞环密封性能变差
B.
吸入滤器脏堵
C.
吸入油液温度过低
D.
吸入阀未打开
查看完整题目与答案
【单选题】【单选】起动往复泵后,不能产生吸排,且吸入真空高度很高,可能原因是
A.
活塞环密封性能变差
B.
_吸入滤器滤网有破洞
C.
吸入滤器脏堵
查看完整题目与答案
【单选题】有活血行气,祛风止痛功效的是( )
A.
三七
B.
熟地
C.
川芎
D.
丹参
E.
当归
查看完整题目与答案
【简答题】I'm so glad to read about the changes taking place in your city. It's really good news that you can travel by subway in Xi'an, though there's only three line there. Here in London we have twelve lines...
查看完整题目与答案
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