问题
选择题
It's dangerous _______ after drinking wine. [ ]
A. driving
B. to drive
C. drive
D. drives
答案
答案：B
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It's dangerous _______ after drinking wine. [ ]
A. driving
B. to drive
C. drive
D. drives
答案：B
后停下，已知卡车质量M为故障车质量m的4倍．设卡车与故障车相撞前的速度为v1,两车相撞后的速度变为v2，相撞的时间极短，求：