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.
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密集的资本运作曾为公司带来短暂的业绩增长，2020-2022年，民德电子净利润保持连续增长，半导体业务也成为公司对外宣传的核心亮点。