1. Also, in a paged system, paging policy. In a virtual storage system, a policy concerning the retention and discard of pages and/or segments. It is expressed by a discard algorithm (in a paged system, a paging algorithm) and implemented by the operating system. Itattempts to ensure that each active process has the pages/segments it requires in primary storage at each phase of execution and that few if any unneeded pages/segments are in primary storage. Most discard policies are FIFO in which the page/segment that has been longest in primary storage is the first to be discarded when additional space is required. Others are LRU in which the one that has remained unused for the longest time is the first to be discarded and FINUFO in which the first to be discarded is the one that has been in primary storage longest and has not been used for a certain length of time or number of instructions.
D. It is imperative to discard the policy of resistance by the government alone and to enforce the policy of total resistance by the whole nation. （丁）必须抛弃单纯政府抗战的方针，实现全面的民族抗战的方针。
