物体b放在物体a上ab的上下表面均与斜面平行当两者以相同的初速度靠惯性沿光�固定斜面c�上做匀减速运动时 Aa受到b的�擦力 Template




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tomski物体b放在物体a上ab的上下表面均与斜面平行当两者以相同的初速度靠惯性沿光�固定斜面c�上做匀减速运动时 aa受到b的�擦力 coloring