如图所示两个质量完全一样的小球从a点沿光�矩形管abcd中的a管和b管由静止�下设转弯处无能量损失比较两球�到c处用时长短bd Template




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tomski如图所示两个质量完全一样的小球从a点沿光�矩形管abcd中的a管和b管由静止�下设转弯处无能量损失比较两球�到c处用时长短bd coloring