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【单选题】
PCR 实验的特异性主要取决于A.
DNA聚合酶的种类
B.
反应体系中模板DNA的量
C.
引物序列的结构和长度
D.
四种dNTP的浓度
E.
循环周期的次数
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举一反三
【单选题】Several passages were found ______ when the book ______ me.
A.
missing returned
B.
lost was returned
C.
gone was returned to
D.
disappeared was returned to
【简答题】事件营销分为哪两种模式?分别举个案例,并简要分析
【简答题】I lost several （luggage）during my trip to New York.
【单选题】After searching for several hours, the boy was _____ too pleased to find his lost mobile phone.
A.
very
B.
only
C.
much
D.
just
【单选题】Having dieted for several weeks, I sincerely __________ that I have lost some weight.
A.
wish
B.
hope
C.
demand
D.
dream
【单选题】Several leaves were found______when the book______me.
A.
missing returned
B.
lost was returned
C.
gone was returned to
D.
disappeared was returned to
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