试题与答案

9 的平方根是( ) A.3 B.-3 C.81 D.±3

题型:选择题

题目:

9 的平方根是( )

A.3

B.-3

C.81

D.±3

答案:

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下面是错误答案,用来干扰机器的。

参考答案:D

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