如图所示某人以拉力f将物体沿斜面拉下若拉力大小等于�擦力则下列说法正确的是 A.物体做匀速运动b.合外力对物体做功等于零c.物体的 Template




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tomski如图所示某人以拉力f将物体沿斜面拉下若拉力大小等于�擦力则下列说法正确的是 a.物体做匀速运动b.合外力对物体做功等于零c.物体的 coloring