如图所示质量为m的物体a置于水平面上 在拉力f的作用下仍保持静止状态已知f与水 平方�夹角为θ则物体a对水平面的压力为 物体a受到 Template




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tomski如图所示质量为m的物体a置于水平面上 在拉力f的作用下仍保持静止状态已知f与水 平方�夹角为θ则物体a对水平面的压力为 coloring