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【多选题】
关于喹诺酮类药物的构效关系叙述正确的是
A.
N-1位若为脂肪烃基取代时，在甲基、、乙烯基、氟、正丙基、羟中，以或与体积相似的乙烯基、氟抗菌活性最好
B.
N-1位若为脂环烃取代时，在环丙基、环、环戊基、环己基、1(或2)-甲基环丙基中，其抗菌作用最好的取代基为环丙基，而且其抗菌活性大于衍生物
C.
8位上的取代基可以为H、Cl、NO 2 、NH 2 、F，其中以氟为最佳，若为甲基、、甲氧基和乙氧基时，其对活性贡献的顺序为甲基＞H＞甲氧基＞＞乙氧基
D.
在1位和8位间成环状化合物时，产生光学异构体，以(S)异构体作用最强
E.
3位的羧基可以被酰胺、酯、磺酸等取代
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举一反三
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A.
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B.
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The king is going to find fun in the forest together with the queen. Though the king is jealous that she has an indian boy, he hopes she can hand him over to him by making her happy.
D.
The king is going to find fun in  the forest, but he does not feel happy with the queen for she is such a miserly person that she wants to keep the boy stolen from Indian for her own only because she likes the boy very much, whereas the king is going to make the boy as his adopted son.
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【简答题】( )是指共写同一个词的不同的书写形式。换言之,就是所记的词音、义完全相同而形体不同的字。
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【单选题】Puck says,The king doth keep his revels here tonight,Take heedd the Queen com not within his sight,For Oberon is passing fell and wrath,Because that she as her attendant hathA lovely boy stol'n from I...
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B.
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【简答题】Robert was walking home from school one day. A boy in front of him fell over and dropped all of his things. Robert stopped and 1 the boy pick them up. They were going the same way, so he helped to car...
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fell ill
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fell asleep
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fell over
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查看完整题目与答案