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【多选题】
下列关于喹诺酮类药物的构效关系描述正确的是
A.
吡酮酸是抗菌作用必需的基本机构
B.
2-位上引入取代基活性消失或减弱
C.
3-位羧基和4-位酮基是抗菌活性的必需基团
D.
在6-位引入氟原子抗菌活性增加
E.
在7-位上引入哌嗪基使活性增加
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参考答案：
举一反三
【判断题】(判断)软件开发中成本、质量和工期三者之间是互斥关系。() A . 错 B . 对
A.
正确
B.
错误
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【单选题】5关于模26的乘法逆元是( )
A.
-5
B.
5
C.
20
D.
以上都不对
查看完整题目与答案
【判断题】软件开发中成本、质量和工期三者之间是互斥关系。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】While we may be interested in the possibilities of social harmony and individual fulfillment that may be achieved through nontraditional education, one cannot help being______about accepting any such ...
A.
concerned … warning of
B.
cautious … panacea for
C.
fastidious … prescription for
D.
reticent … renovation of
E.
agitated … postscript. to
查看完整题目与答案
【单选题】_____, they went home, _____. [     ]
A.
Their work had been finished; singing and laughing
B.
They had finished their work; sang and laughed
C.
Their work finished; singing and laughing
D.
After their work finished; singing and laughing
查看完整题目与答案
【多选题】下列包含在电子商务涉及的法律问题中的是( )
A.
网络欺诈
B.
知识产权保护
C.
电子支付
D.
纠纷解决机制
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【判断题】软件开发中成本、质量和工期三者之间是互斥关系。（）
A.
正确
B.
错误
查看完整题目与答案
【判断题】软件开发中成本、质量和工期三者之间是互斥关系。（ ）
A.
正确
B.
错误
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【单选题】听力原文： A good modern newspaper is an extraordinary piece of reading. It is remarkable first for what it contains: the range of news from local crime to international politics, from sport to business an...
A.
Wide coverage of events.
B.
Quick speed of production.
C.
Immediacy of reporting.
D.
Focus on local events.
查看完整题目与答案
【单选题】听力原文： A good modern newspaper is an extraordinary piece of reading. It is remarkable first for what it contains: the range of news from local crime to international politics, from sport to business an...
A.
Wide coverage of events.
B.
Quick speed of production.
C.
Immediacy of reporting.
D.
Focus on local events.
查看完整题目与答案
相关题目：
【判断题】(判断)软件开发中成本、质量和工期三者之间是互斥关系。() A . 错 B . 对
A.
正确
B.
错误
查看完整题目与答案
【单选题】5关于模26的乘法逆元是( )
A.
-5
B.
5
C.
20
D.
以上都不对
查看完整题目与答案
【判断题】软件开发中成本、质量和工期三者之间是互斥关系。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】While we may be interested in the possibilities of social harmony and individual fulfillment that may be achieved through nontraditional education, one cannot help being______about accepting any such ...
A.
concerned … warning of
B.
cautious … panacea for
C.
fastidious … prescription for
D.
reticent … renovation of
E.
agitated … postscript. to
查看完整题目与答案
【单选题】_____, they went home, _____. [     ]
A.
Their work had been finished; singing and laughing
B.
They had finished their work; sang and laughed
C.
Their work finished; singing and laughing
D.
After their work finished; singing and laughing
查看完整题目与答案
【多选题】下列包含在电子商务涉及的法律问题中的是( )
A.
网络欺诈
B.
知识产权保护
C.
电子支付
D.
纠纷解决机制
查看完整题目与答案
【判断题】软件开发中成本、质量和工期三者之间是互斥关系。（）
A.
正确
B.
错误
查看完整题目与答案
【判断题】软件开发中成本、质量和工期三者之间是互斥关系。（ ）
A.
正确
B.
错误
查看完整题目与答案
【单选题】听力原文： A good modern newspaper is an extraordinary piece of reading. It is remarkable first for what it contains: the range of news from local crime to international politics, from sport to business an...
A.
Wide coverage of events.
B.
Quick speed of production.
C.
Immediacy of reporting.
D.
Focus on local events.
查看完整题目与答案
【单选题】听力原文： A good modern newspaper is an extraordinary piece of reading. It is remarkable first for what it contains: the range of news from local crime to international politics, from sport to business an...
A.
Wide coverage of events.
B.
Quick speed of production.
C.
Immediacy of reporting.
D.
Focus on local events.
查看完整题目与答案
参考解析：
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