A:电子工业
B:原子能工业
C:石油工业
D:航天工业
若定义在R上的函数f(x)满足f(0)=﹣1,其导函数f′(x)满足f′(x)>k>1,则下列结论中一定错误的是( )
A. I spent two hours there.
B. He is Yang Liwei.
C. I went to my friend's house.
D. I was born in 2004.
E. No, I didn't.
物体受水平力F作用,在粗糙水平面上运动,下列说法中正确的是( )