A. N(9,10) B.N(9,102) C. N(9,5) D.N(9

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问题 A. N(9,10) B.N(9,102)C. N(9,5) D.N(9,2)

选项

答案A

解析[img]/upload/tiku/190/2457400_1.jpg[/img]
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