如图所示质量相同的小球ab用不可伸长的轻细线悬在等高的o1o2点系a球的悬线比系b球的悬线长.把两球的悬线均拉至水平后将小球无初速 Template




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tomski如图所示质量相同的小球ab用不可伸长的轻细线悬在等高的o1o2点系a球的悬线比系b球的悬线长.把两球的悬线均拉至水平后将小球无初速 coloring