如图所示用平行斜面�下的拉力f将一个物体沿斜面往下拉动拉力的大小等于�擦力则 A.物体做匀速运动 b.合力对物体所做的功等于零 C Template




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tomski如图所示用平行斜面�下的拉力f将一个物体沿斜面往下拉动拉力的大小等于�擦力则 a.物体做匀速运动 b.合力对物体所做的功等于零 coloring