12.如图所示一质量为m的楔形木块放在水平桌面上它的顶角为90°两底角为α和βab为两个位于斜面上质量均为m的木块.已知所有接触面 Template




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tomski12.如图所示一质量为m的楔形木块放在水平桌面上它的顶角为90°两底角为α和βab为两个位于斜面上质量均为m的木块.已知所有接触面 coloring