题目内容

A) She doesn't know where it is.B) She doesn't want to go fishing with the man.C)

A. She doesn't know where it is.
B. She doesn't want to go fishing with the man.
C. She will not go because it's too far.
D. She will go although it is far.

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整群抽样的最大缺点是()。

科目编号就是按科目编码方案对每一科目的编码进行定义,其作用是()。

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