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【单选题】
以下几种抽样调查方法中，属于单纯随机抽样的是()。A.
系统抽样
B.
多次分层抽样法
C.
乱
D.
分层比例抽样法
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举一反三
【简答题】在全面内战爆发的前夕,1946年5月4日,中央发出(),史称指示
【简答题】Reading comprehension (10184) : There is a passage in this section which is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C, and D. you shou...
【单选题】What can we learn from the second paragraph about romantic love?
A.
It is a common occurrence among the old.
B.
It is primarily depicted by books.
C.
It is characterized by mutual attraction and absorption.
D.
It is rejected as flighty and irrational.
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