如图所示物体a静止在粗糙的水平面上现用一水平外力f推物体af增大 物体a仍保持静止则以下说法中正确的是 A.物体a所受的�擦力一定 Template




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tomski如图所示物体a静止在粗糙的水平面上现用一水平外力f推物体af增大 物体a仍保持静止则以下说法中正确的是 a.物体a所受的�擦力一定 coloring