皮皮学，免费搜题
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【单选题】
下列哪种物质在PCR反应中不能作为模板A.
cDNA
B.
DNA
C.
RNA
D.
蛋白质
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】A market is defined as perfectly contestable if
A.
entry to it is costless, but exit from it is costly
B.
entry to it is costly, but exit from it is costless
C.
entry to it and exit from it are both costly
D.
entry to it and exit from it are both costless
【简答题】在我国现存的所有制结构中，私营经济（ ）。
【多选题】在我国现存的所有制结构中,私营经济
A.
不受公有制经济的影响和制约
B.
以生产资料私人占有和雇佣劳动为基础
C.
是由社会主义初级阶段的生产力发展状况决定其存在的
D.
是社会主义市场经济的组成部分
【单选题】Where do Bob and Ellen want to go?
A.
To a rock and mineral show.
B.
To an opera at the concert hall.
C.
To a movie at the student center.
D.
To a popular music concert.
【单选题】Where do Bob and Helen want to go?
A.
To a rock and mineral show.
B.
To an opera at the concert hall.
C.
To a movie at the student center.
D.
To a popular music concert.
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