![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
如图,在矩形ABCD中,AB=6,BC=8,过对角线交点O作EF⊥AC交AD于点E,交BC于点F,则DE的长是()
A.1
B.7/4
C.2
D.12/5
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
B、7/4
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.1
B.7/4
C.2
D.12/5
B、7/4
A.q \f(3\r(10),2)
B.q \f(3\r(10),5)
C.q \f(\r(10),5)
D.q \f(3\r(5),5)
A.6.5
B.6
C.5.5
D.5
A.当AB=BC时,它是菱形
B.当AC=BD时,它是正方形
C.当AC⊥BD时,它是菱形
D.当∠ABC=90°时,它是矩形