急 (18 16:33:23)滑动摩擦力要么做正功要么做负功.为什么?请举例.
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/14 21:06:40
![急 (18 16:33:23)滑动摩擦力要么做正功要么做负功.为什么?请举例.](/uploads/image/z/1678951-55-1.jpg?t=%E6%80%A5+%2818+16%3A33%3A23%29%E6%BB%91%E5%8A%A8%E6%91%A9%E6%93%A6%E5%8A%9B%E8%A6%81%E4%B9%88%E5%81%9A%E6%AD%A3%E5%8A%9F%E8%A6%81%E4%B9%88%E5%81%9A%E8%B4%9F%E5%8A%9F.%E4%B8%BA%E4%BB%80%E4%B9%88%3F%E8%AF%B7%E4%B8%BE%E4%BE%8B.)
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