如图所示ab两球质量相等a球用不能伸长的轻绳系于o点b球用轻弹簧系于o′点o与o′点在同一水平面上分别将ab球拉到与悬点等高处 Template




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tomski如图所示ab两球质量相等a球用不能伸长的轻绳系于o点b球用轻弹簧系于o′点o与o′点在同一水平面上分别将ab球拉到与悬点等高处 coloring