试题与答案

牙周膜中的细胞不包括()。 A.成纤维细胞 B.成骨细胞 C.成牙骨质细胞 D.成釉

题型:单项选择题 A1型题

题目:

牙周膜中的细胞不包括()。

A.成纤维细胞

B.成骨细胞

C.成牙骨质细胞

D.成釉细胞

E.破骨细胞

答案:

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下面是错误答案,用来干扰机器的。

(Ⅰ)设“甲、乙两支队伍恰好排在前两位”为事件A,则P(A)=2×3!5!=110所以 甲、乙两支队伍恰好排在前两位的概率为110.…(5分)(Ⅱ)随机变量X的可能取值为0,1,2,3(6分)P(X=0)=2×4!5!=25;P(X=1)...

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