http://cache.baidu.com/c?word=%C8%E7%BA%CE%3B%B2%E9%BF%B4%3Bcpu%3B%B5%C4%3B%B1%E0%BA%C5&url=http%3A//www%2E525asp%2Ecom/News/20051014193957%2Ehtml&b=18&a=0&user=baidu 这里网站写的很详细~~~~~~~~~~~~~~~~~~~