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The A/D bits exist entirely for the operating system's benefit. The Accessed bit tells the OS which pages have been recently used, enabling page replacement algorithms to choose pages to evict when memory runs low. The Dirty bit tells the OS which pages have been modified and must be written back to disk before eviction; clean pages can simply be discarded and re-read from disk later.
。业内人士推荐服务器推荐作为进阶阅读
在自主品牌阵营中，海星游艇是最具代表性的样本。自2007年投产以来，专注80英尺以上中大型豪华游艇，在中国大陆该尺寸段保有量市占率约70%，稳居全球超级游艇订单排行榜前30强，率先在高端领域撕开欧美垄断的口子。
I'm not saying any of this through any sort of Apple-loving bias. I typically use a MacBook Pro for work, but I'm a Windows user at heart. Windows was my gateway to computing in the '90s, back when Macs were far more expensive than PCs. These days, I spend more time on my Windows desktop making podcasts, playing PC games and bumming around the internet than I do working on Macs.