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要从165个人中抽取15人进行身体检查,现采用分层抽样的方法进行抽取,若这165...
要从165个人中抽取15人进行身体检查,现采用分层抽样的方法进行抽取,若这165人中老人的人数为22人,则老年人中被抽到参加健康检查的人数是( )
A.5人
B.2人
C.3人
D.1人
考点分析:
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A.56
B.250
C.2401
D.2450
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已知实数x,y满足x
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B.
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C.m≤-3或m≥
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2,b
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2(a
2-a
1)=( )
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B.-8
C.±8
D.
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A.
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C.
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D.y=log
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