试题与答案

一列火车有n节相同的车厢,一观察者站在第一节车厢的前端,当火车由静止开始做匀加速

题型:选择题

题目:

一列火车有n节相同的车厢,一观察者站在第一节车厢的前端,当火车由静止开始做匀加速直线运动时(  )
A.每节车厢末端经过观察者时的速度之比是1:2:3:…:n

B.每节车厢经过观察者所用的时间之比是

C.在相等时间里,经过观察者的车厢节数之比是1:2:3:…:n
D.如果最后一节车厢末端经过观察者时的速度为v,那么在整个列车经过观察者的过程中,平均速度为v/n

答案:

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参考答案:D解析:社会工作督导具有行政、教育和支持三大功能。其中支持的功能是要求督导者向被督导者提供心理和情感上的支持,促使被督导者感到自我的重要性与价值感,让被督导者能轻松面对工作。D项属于支持的...

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Now , some of my classmates and I were  53  to study in a middle school in Jiangsu Province. I still  54  dreaming and still strive for a better future: to make our homes beautiful yet  55  .
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