运动过程
运动时间
运动状态
匀加速运动
0~40s
初速度 v0=0 ；末速度 v=4.2m/s
匀速运动
40~640s
v=4.2m/s
匀减速运动
640~720s
靠岸时的速度 vt=0.2m/s
偶函数f(x)满足f(x-1)=f(x+1)，当x∈0,1时, f(x)=1-x，则关于x的方程fx=(19)x在x∈0,3上解的个数是（ ）
在特定的历史阶段，口号、标语往往有着强烈的政治色彩，被打上了时代的烙印。下列口号、标语出现在文化大革命时期(1966～1976年)的是（ ）
A: Hello, Mike.
B: Hello, Lucy.
A: ____
B: I'm feeling better now.
B: He said I had got a bad cold.
B: No, I can't. I have to stay in bed for a few days.
B: Could you help me with my lessons when I am well?
A: Sure. ____
B: Thank you.
A. What's wrong with you?
B. I hope you'll be better soon.
C. Can you come to school today?
D. How are you today?
E. I'm sorry to hear that.
F. What did the doctor say?
G. Are you feeling better now?
