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【多选题】
在抽样估计中,影响抽样误差的因素有( )A.
总体内部的差异程度
B.
抽样调查人员的构成
C.
样本容量的大小
D.
抽样的方法
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【简答题】锉刀的齿纹有 和 两种。
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【简答题】阅读短文，判断正误，正确的用“T”表示，错误的用“F”表示。 Mike is a small boy. He hates (讨厌) soap and water. His mother says,'Mike, your hands are very dirty. Go and wash your hands.' Mike washes his hands in the water quickly....
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