关于摩擦力的功,下列说法正确的是 ( )A.静摩擦力总是做正功,滑动摩擦力总是做负功B.静摩擦力对物体不一定做功,滑动摩擦力对物体一定做功C.静摩擦力对物体一定做功,滑动摩
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![关于摩擦力的功,下列说法正确的是 ( )A.静摩擦力总是做正功,滑动摩擦力总是做负功B.静摩擦力对物体不一定做功,滑动摩擦力对物体一定做功C.静摩擦力对物体一定做功,滑动摩](/uploads/image/z/3501327-39-7.jpg?t=%E5%85%B3%E4%BA%8E%E6%91%A9%E6%93%A6%E5%8A%9B%E7%9A%84%E5%8A%9F%2C%E4%B8%8B%E5%88%97%E8%AF%B4%E6%B3%95%E6%AD%A3%E7%A1%AE%E7%9A%84%E6%98%AF%EE%80%83+%EF%BC%88+%EF%BC%89A%EF%BC%8E%E9%9D%99%E6%91%A9%E6%93%A6%E5%8A%9B%E6%80%BB%E6%98%AF%E5%81%9A%E6%AD%A3%E5%8A%9F%2C%E6%BB%91%E5%8A%A8%E6%91%A9%E6%93%A6%E5%8A%9B%E6%80%BB%E6%98%AF%E5%81%9A%E8%B4%9F%E5%8A%9F%EE%80%83B%EF%BC%8E%E9%9D%99%E6%91%A9%E6%93%A6%E5%8A%9B%E5%AF%B9%E7%89%A9%E4%BD%93%E4%B8%8D%E4%B8%80%E5%AE%9A%E5%81%9A%E5%8A%9F%2C%E6%BB%91%E5%8A%A8%E6%91%A9%E6%93%A6%E5%8A%9B%E5%AF%B9%E7%89%A9%E4%BD%93%E4%B8%80%E5%AE%9A%E5%81%9A%E5%8A%9F%EE%80%83C%EF%BC%8E%E9%9D%99%E6%91%A9%E6%93%A6%E5%8A%9B%E5%AF%B9%E7%89%A9%E4%BD%93%E4%B8%80%E5%AE%9A%E5%81%9A%E5%8A%9F%2C%E6%BB%91%E5%8A%A8%E6%91%A9)
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