John runs fastest in our school. I think he is ____ (certainly) to win this game.
在直角坐标系xOy中,O为坐标原点,点M的横纵坐标分别为茎叶图中位数和众数,若点N(x,y)的坐标满足x2+y2≤42x-y≥0y≥0,求OM→•ON→的最大值.
羚羊在狂奔,长颈鹿伸着脖子吃树梢上的嫩枝绿叶,成群的斑玛向水草地迁移,凶猛的狮子和豹紧追其后,赶上落后的斑马,饱餐一顿.这种景观出现在( )
下面字母各表示几:
A=____ ,B=____ ,C=____ ,D=____ .