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【单选题】
作直线运动的甲、乙、丙三物体，质量之比是 1∶2∶3．若它们的动能相等，并且作用于每一个物体上的制动力的大小都相同，方向与各自的速度方向相反，则它们制动距离之比是A.
1:1:1
B.
1:2:3
C.
3:2:1
D.
1:4:9
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举一反三
【简答题】（C） Bali is a tiny island that is part of Indonesia(印度尼西亚) today. It is a pretty island that has many mountains and a pleasant climate. For a long time, Bali was cut off from much of the world. The pe...
【单选题】Festivals are held on Bali__________
A.
on such important occasions as births, marriages and deaths
B.
whenever people would like to have one
C.
on fixed dates
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