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截至发稿前，市场的喧嚣已然归位：豆包重新稳住榜首，千问守住第二，而部分靠红包冲量的产品排名正随着假期结束大幅回落。业内人士直言，红包拉新的 7 日留存率可能不到 20% —— 巨额补贴买来了瞬时的流量波峰，却没能买到用户真正的停留。
DOS 2.0 was developed to support the IBM PC/XT (introduced in March 1983), which came with 128K RAM standard, and models with 256K appeared soon enough. Even the older PCs could be upgraded with additional RAM, and DOS needed to have some mechanism to deal with that extra memory.