如图所示拉力f将物体沿斜面拉下已知拉力大小与�擦力大小相等则下列说法中正确的是 A.物体的总机械能增加b.物体的总机械能保持不变c Template




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tomski如图所示拉力f将物体沿斜面拉下已知拉力大小与�擦力大小相等则下列说法中正确的是 a.物体的总机械能增加b.物体的总机械能保持不变c coloring