如图所示o为竖直平面内圆�的最高点abcd为圆�上的四点现让小物块沿oaobocod由静止下�下�到abcd四点所用 Template




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tomski如图所示o为竖直平面内圆�的最高点abcd为圆�上的四点现让小物块沿oaobocod由静止下�下�到abcd四点所用 coloring