12月19日，北京口腔医院新建主院区，患者在院内接受治疗。本版图片/北京口腔医院供图
The first thing a multi-tasking operating system needs from hardware is isolation: multiple programs must share one processor without being able to read, write, or jump into each other's memory. The 80386 achieves this through memory protection -- two independent address translation layers.
。同城约会对此有专业解读
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