汽车前进,靠的是地面对轮胎的�擦力?�擦力是阻力,怎么能成前进的推动力? 知乎 Template




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tomski汽车前进,靠的是地面对轮胎的�擦力?�擦力是阻力,怎么能成前进的推动力? 知乎 coloring