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【简答题】
设有一个栈,按 A. B、C、D的顺序进栈,则可能为出栈序列的是( ) A.DCBA B. CDAB C. DBAC D. DCAB
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举一反三
【简答题】A．He was not hungry. B．He had already had his breakfast. C．He was too tired. D．He wanted to sleep a little more.
【单选题】His aunt wanted to have him _______ the radio, but he had had it ________ already.
A.
repair, repair
B.
to repair, repair
C.
repaired, to repair
D.
repair, repaired
【简答题】By the time he was ten,Edison______experiments in chemistry. A．had already done B．already had done C．was already doing D．already did
【单选题】酶活力国际单位的定义是
A.
在最适条件下，每分钟催化1mmol底物反应所需的酶量
B.
在最适条件下，每分钟催化1mmol底物反应所需的酶量
C.
在37℃条件下，每分钟催化1mmol底物反应所需的酶量
D.
在实验室条件下，每秒钟催化1mmol底物反应所需的酶量
E.
在实验室规定条件下，每分钟催化1umol底物反应所需的酶量
【简答题】酶活力国际单位的定义
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