如图所示物体ab置于水平地面上与地面动�擦因数均为μ物体ab用一跨过动�轮的细绳相连现用逐渐增大的力�上提动�轮某时刻拉a物体的 Template




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tomski如图所示物体ab置于水平地面上与地面动�擦因数均为μ物体ab用一跨过动�轮的细绳相连现用逐渐增大的力�上提动�轮某时刻拉a物体的 coloring