如图所示物块ab叠放在粗糙的水平桌面上水平外力f作用在b上使ab一起沿水平桌面�右匀速运动.设ab之间的�擦力为f1b与水平桌面 Template




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tomski如图所示物块ab叠放在粗糙的水平桌面上水平外力f作用在b上使ab一起沿水平桌面�右匀速运动.设ab之间的�擦力为f1b与水平桌面 coloring