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【简答题】
At dawn, Mae Tuck set out on her horse for the wood at the edge of the village of Treegap. She was going there, as she did once every ten years, to meet her two sons, Miles and Jesse, and she was feeling at ease. At noon time, Winnie Foster, whose family owned the Treegap wood, lost her patience at last and decided to think about running away.
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【简答题】如图所示，一轻质弹簧和两个小球组成的系统，放在不计一切摩擦的水平面上．今压缩弹簧后松手，小球在运动过程中该系统的机械能是否改变?
【单选题】如图所示,一水平运动的球压缩弹簧,该弹簧的劲度系数为100N/m 。当弹簧被压缩过程中,小球减速。问当弹簧长度由原长压缩了0.2m时,弹簧弹力对小球做的功是( )
A.
4J
B.
2J
C.
-2J
D.
-4J
【简答题】某配合基本尺寸为∮60mm,Xmax=40μm, Th=30 μm, Ts=20 μm, es=0, 计算得ES=( )、EI=( )、ei=( )、Tf=( )。