如图所示倾角为30°的斜面体固定在水平地面上一根不可伸长的轻绳两端分别系着小球a和物块b跨过固定于斜面体顶端的�轮o.a的质量为mb的 Template




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tomski如图所示倾角为30°的斜面体固定在水平地面上一根不可伸长的轻绳两端分别系着小球a和物块b跨过固定于斜面体顶端的�轮o.a的质量为mb的 coloring