6.如图2所示水平地面上的物体a在斜�上的拉力f作用下�右作匀速直线运动则 A.物体a可能不受地面支持力的作用 B.物体a可能受到三个 Template




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tomski6.如图2所示水平地面上的物体a在斜�上的拉力f作用下�右作匀速直线运动则 a.物体a可能不受地面支持力的作用 b.物体a可能受到三个 coloring