如图所示物体a与b之间的�动�擦力为fb与地面间无�擦b的长度为l如果b以速度v�左运动a以速度v0从左�右从b上面�过这一过程中 Template




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tomski如图所示物体a与b之间的�动�擦力为fb与地面间无�擦b的长度为l如果b以速度v�左运动a以速度v0从左�右从b上面�过这一过程中 coloring