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.
第二百条 同一船舶所有人的船舶之间进行的救助，救助方获得救助款项的权利适用本章规定。
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其次是BD项目早期化意味着中国创新药企平台化能力的价值重估。传统BD模式下，中国药企的收入呈现脉冲式特征，即在签约时获得首付款，在达到特定里程碑时获得阶段性付款，最终在产品上市后获得销售分成，整个时间跨度长、不确定性高。