如图所示半径为r内径很小的光�半圆管竖直放置两个质量均为m的小球ab以不同的速度进入管内.a通过最高点c时对管壁上部压力为3mgb Template




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tomski如图所示半径为r内径很小的光�半圆管竖直放置两个质量均为m的小球ab以不同的速度进入管内.a通过最高点c时对管壁上部压力为3mgb coloring