如图所示物体a和b叠放在水平面上在水平恒力fl=7n和f2=4n的作用下处于静止状态此时b对a的�擦力为f1地面对b的�擦力为f2则 Template




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tomski如图所示物体a和b叠放在水平面上在水平恒力fl=7n和f2=4n的作用下处于静止状态此时b对a的�擦力为f1地面对b的�擦力为f2则 coloring