20.质量为m的小球b放在半径为r的光�球面上如图所示有悬点到球面的最短距离为ac=sa点在球心的正上方求 1小球对球面的压力 Template




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tomski20.质量为m的小球b放在半径为r的光�球面上如图所示有悬点到球面的最短距离为ac=sa点在球心的正上方求 1小球对球面的压力 coloring