Intel documentation describes the 386's Protection Test Unit as a component that "implements fast testing of complex memory protection functions." It is mostly composed of a PLA (Programmable Logic Array), referred to as Test PLA by Intel, that is physically visible by its regular appearance on the die. This single piece of combinational logic replaces what would otherwise be dozens of multi-cycle conditional branches in the microcode. Instead of testing privilege rules sequentially, the microcode issues a single protection test operation, and the PLA evaluates all applicable rules in parallel, producing a complete decision in one evaluation: continue, fault, or redirect to a gate handler.
这类场景也很能体现 Expert 的定位，它尝试把一整段专业工作流程产品化，从增强单次问答的模式里彻底跳了出来。。夫子对此有专业解读
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How does nuclear power work and why is the UK investing in it?。业内人士推荐旺商聊官方下载作为进阶阅读
Thinking Step 2: 推理第一个人。如果他不想要，他会直接说“不”（因为只要有一个不要，全称命题为假）。他说“不知道”，说明他自己想要，但他不确定后面两个人想不想要。