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【简答题】
对DNA聚合酶Ⅲ催化反应的叙述，正确的是( ) A．以一磷酸核苷为作用物 B．合成反应的方向为5＇→3＇ C．以NAD ＋ 为辅酶 D．生成磷酸二酯键
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举一反三
【单选题】We couldn't have passed the final examination ______ your help.
A.
but for
B.
without
C.
if it had not been for
D.
All of the above.
【单选题】If it ______ for the fence, he ______ into the river.A. were not; fallenB. had not been; could h
A.
41. If it ______ for the fence, he ______ into the river. A. were not; fallen
B.
had not been; could have fallen C were not; could fall D. had not been; could fall
【多选题】各国信息披露所采用的重大性概念有以下()标准
A.
影响投资者决策标准
B.
影响证券市场上市公司涨跌幅度标准
C.
影响证券市场价格标准
D.
影响证券市场资金流动性标准
【简答题】神经胶质细胞的主要功能是什么?
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