—______. We don't have enough money.
A:Sounds great
B:I am afraid not
C:Don't mention it.
如图,在△ABC中,∠C=45°,D为BC中点,BC=2,记锐角∠ADB=α.且满足cos2α=﹣725.
(1)求cos∠CAD;
(2)求BC边上的高h的值.
A、 B、 C、 ____水壶装的水最多; ____水壶装的水最少。
植物体组成的结构层次是( )