如图所示弹簧下端悬一�轮跨过�轮的细线两端系有ab两重物mb=3kga的质量不确定.两物体都悬空均可上下运动.不计线�轮质量及 Template




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tomski如图所示弹簧下端悬一�轮跨过�轮的细线两端系有ab两重物mb=3kga的质量不确定.两物体都悬空均可上下运动.不计线�轮质量及 coloring