A．物体的速度一定很大
B．物体的速度一定增大
C．物体速度的变化一定很大
D．物体的速度变化一定很快
答案：D
在曲线y=x3＋3x2＋6x＋10的切线中，斜率最小的切线方程是___________.
________for her, Chen Zhong, the last champion, had no chance to take part in the finals. [ ]
A. Luckily
B. Unfortunately
C. Obviously
D. Absolutely
