如图所示斜面除ab段粗糙外其余部分都是光�的一个物体从顶点�下经过ac两点时的速度相等且ab=bc物体与ab段动�擦因数处处 Template




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tomski如图所示斜面除ab段粗糙外其余部分都是光�的一个物体从顶点�下经过ac两点时的速度相等且ab=bc物体与ab段动�擦因数处处 coloring