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【单选题】
在抗代谢抗肿瘤药氟尿嘧啶分子产生过程中,采用电子等排原理的结构是A.
以吡啶环代替苯环
B.
以羟基代替羧基
C.
以氟代替氢
D.
以氯代替碳
E.
以氯代替氢
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皮皮学刷刷变学霸
举一反三
【单选题】Has someone suggested there _____ be an international language all could understand and use _____ ? [ ]
A.
can;it
B.
may;／
C.
/; /,
D.
would; it
【单选题】The market for non-food GE products could exceed the market for GE food products by a wide______within the next few years.
A.
variety
B.
margin
C.
range
D.
spectrum
【简答题】Why could someone get a day off when everybody else had to work?
【简答题】Could you find someone _________? (A) for me to play tennis with (B) play tennis with (C) for me to play tennis (D) playing tennis with
【简答题】火焰原子吸收光谱法中，吸光物质是火焰中各种原子。( )
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