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【单选题】
2016-34. 嘌呤核苷酸补救合成途径的底物是A.
天冬氨酸
B.
谷氨酰胺
C.
腺嘌呤
D.
甘氨酸
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举一反三
【单选题】If you read the book (a second time), (and you) will probably have (quite a different) understanding of the events (described) in lt.
A.
a second time
B.
and you
C.
quite a different
D.
described
【单选题】If you go by _____ train, you can have quite a comfortable journey,but make sure you get _____ fast one. [ ]
A.
/, /
B.
/, a
C.
the, a
D.
/, the
【判断题】由数据对象(包括设计者在实时数据库中定义的数据对象、系统内部数据对象和系统函数)、括号和各种运算符组成的运算式称为表达式,表达式的计算结果称为表达式的值。( )
A.
正确
B.
错误
【单选题】If you read the book a (second time), (and you) will probably have (quite a different) understanding of the events (described) in it.
A.
second time
B.
and you
C.
quite a different
D.
described
【简答题】Co(NH3) 4 2+ 为深蓝色,而 Co(NH3) 4 2+ 则为无色,试说明其原因。
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