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.
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，这一点在91视频中也有详细论述
Acceptable use policy
“省市县乡领导班子将陆续换届，强调政绩观也很有针对性。”在开局之年的“第一课”上，习近平总书记道出了树立和践行正确政绩观的另一层深远考量。