如图所示两块相同的砖ab其长宽厚之比为421叠放在水平地面上若a对b的压力和压强分别为f1和p1b对地面的压力和压强分别 Template




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tomski如图所示两块相同的砖ab其长宽厚之比为421叠放在水平地面上若a对b的压力和压强分别为f1和p1b对地面的压力和压强分别 coloring