百米赛跑运动员跑完全程所用的时间是12.5s,在此过程中,他所做的是______运动,他的速度是_____ 米/秒,这个速度是指它的____________。
变速;8;平均速度
The combination of the two companies had to be suspended(暂停), because neither would _____
to _____ in terms of leadership. [ ]
A. give in; the other
B. give up; the other
C. give up; another
D. give in; another
湿空气是指()和()的混合气体