答案:A
— Does your leg still ____?
— Yes. It ____ a lot when I am trying to move it a bit. [ ]
A. hurt; hurts
B. wound; wounds
C. injure; injures
D. pain; pains
设f(x)有连续导数,且f(0)=0,f’(0)≠0,。当x→0时,F’(x)与xk是同阶无穷小量,则k=()。
A.1
B.2
C.3
D.4