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【单选题】
设 X ~ N ( μ , 4 2 ), X ~ N ( μ , 5 2 ) , 而 p 1 = P ( X ≤ μ − 4), p 2 = P ( Y ≥ μ + 5) , 则( ).A.
对任何实数 μ ， p 1 = p 2
B.
对任何实数 μ ， p 1 < p 2
C.
对 μ 的个别值，有 p 1 = p 2
D.
对任何实数 μ ， p 1 > p 2
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A.
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C.
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D.
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A.
a very good acrobat
B.
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C.
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D.
HIV positive
【单选题】口腔健康调查目的描述哪项是不正确的
A.
查明口腔疾病在特定时间内的发生频率和分布特征及流行规律
B.
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C.
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D.
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E.
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【单选题】Why did Tom go to school on foot?
A.
Because he didn't catch the bus.
B.
Because he got up very early.
C.
Because he wanted to do exercises.
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