8.如图所示斜面体a静止在水平地面上物块b在水平推力f作用下静止在a的斜面上b与a之间的�擦力大小为f1a与地面间的静�擦力大小为f2 Template




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tomski8.如图所示斜面体a静止在水平地面上物块b在水平推力f作用下静止在a的斜面上b与a之间的�擦力大小为f1a与地面间的静�擦力大小为f2 coloring