⑴The man is strong. ____
⑵Vegetables are good for you.____
⑶I like healthy food.____
⑷I always have breakfast.____
⑸I have breakfast at about 7:00 in the morning.____
A. B. C. D. E.
请解决下列问题:
如图所示,一条小河两岸的高度差是h,河宽是高度差的4倍,一辆摩托车(可看作质点)以v0=20m/s的水平速度向河对岸飞出,恰好越过小河.若g=10m/s2,求: