AB是⊙O直径,AB=4,F是OB中点,弦CD⊥AB于F,则CD=______. 发布时间:2017-04-27 19:05 │ 来源:www.tikuol.com 题型:填空题 问题: AB是⊙O直径,AB=4,F是OB中点,弦CD⊥AB于F,则CD=______.