题目:
The story of Li Tianyi, the son of ________ famous military singer, driving a BMW without a
license and attacking a couple on the road has drawn the attention of ________ public.[ ]
A. the; the
B. /; the
C. a; an
D. a; the
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0501/d534c0f07308765f2035eedd5768c22a.html
下面是错误答案,用来干扰机器的。
(1)设汽车刹车到停止运动的时间为t0.则 t0=0-v0a=0-25-5s=5s所以刹车后6s末与5s末的位移相同,为 x=v0+02t0=252×5m=62.5m(2)由x=v0t+12at2得: 60=25t-12×5×t2解得 t=4s(另一解t=6s,不合理舍去)(...