A:to equip; with
B:equipping; with
C:to equip;for
D:equipping; for
如图,在△ABC中,∠BAC=90°,AB=AC,AE是经过A点的一条直线,且B,C在AE的两侧,BD⊥AE于D,CE⊥AE于E,CE=2,BD=6,则DE的长为( )
做眼保健操用了5____