A:whatever; save
B:whatever; to save
C:what; saving
D:what; to save
____改为____
如图,△ABC中,点O是边AC上一个动点,过O作直线MN∥BC.设MN交∠ACB的平分线于点E,交∠ACB的外角平分线于点F.
(1)求证:OE=OF;
(2)若CE=8,CF=6,求OC的长;
(3)当点O在边AC上运动到什么位置时,四边形AECF是矩形?并说明理由.
–Can I help you?
一Yes. I'd like to buy ____ eraser.
Tom is behind Jim, Jim is __________Tom.