问题
选择题
_____ is known to us all is that the 2012 Olympic Games will take place in London.[ ]
A. It
B. Which
C. As
D. What
答案
答案：D
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_____ is known to us all is that the 2012 Olympic Games will take place in London.[ ]
A. It
B. Which
C. As
D. What
答案：D
与活塞一起向下运动，向下运动过程中活塞可达到的最大速度为v，求从活塞开始向下移动到达最大速度的过程中活塞对封闭气体做的功。(被封闭气体温度不变，外界大气压强为p0) 