如图所示物体a以一定的初速度沿粗糙斜面上�斜面固定不动则物体a在上�过程中以下说法正确的是 A.物体a受到重力支持力�动�擦力 Template




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tomski如图所示物体a以一定的初速度沿粗糙斜面上�斜面固定不动则物体a在上�过程中以下说法正确的是 a.物体a受到重力支持力�动�擦力 coloring