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【单选题】
高钾血症是指血清钾浓度高于A.
3．0mmol／L
B.
3．5mmol／L
C.
5．5mmol／L
D.
5．0mmol／L
E.
6．0mmol／L
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【单选题】两样本均数比较的t检验，P＜0.05，按a=0.05水准，认为两总体均数不同。此时若推断有误，则犯第一类错误的概率
A.
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B.
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C.
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D.
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E.
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