如图所示水平地面上有一楔形物体bb的斜面上有一小物块aa与b之间.b与地面之间均存在�擦.已知楔形物体b静止时a静止在b的斜面上.现给 Template




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tomski如图所示水平地面上有一楔形物体bb的斜面上有一小物块aa与b之间.b与地面之间均存在�擦.已知楔形物体b静止时a静止在b的斜面上.现给 coloring