问题:
[单选题]12.如图3,正方体ABCD-A'B'C'D'的棱长为2,F是棱C'D'的中点,则AF 的长为( ).
A.3
B.5
C.√5
D.2√2
E.2√3
Tags:管理类联考试题
答案解析:
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