3.水平地面上斜放着一块木板ab如图1所示上面静止着 一个木块设木块对斜面的压力为fn木块所受重力沿斜 面的分力为g1若使斜面的端 Template




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tomski3.水平地面上斜放着一块木板ab如图1所示上面静止着 一个木块设木块对斜面的压力为fn木块所受重力沿斜 面的分力为g1若使斜面的端 coloring