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you expect indexing to be an O(1) operation.，推荐阅读新收录的资料获取更多信息
Write Protect (bit 16 of CR0) — When set, inhibits supervisor-level procedures from writing into read- only pages; when clear, allows supervisor-level procedures to write into read-only pages (regardless of the U/S bit setting; see Section 4.1.3 and Section 4.6).。业内人士推荐新收录的资料作为进阶阅读
Before we dive in, let me make one thing crystal clear: this isn't the first solar-powered power bank I've tested -- but it is the best. By far. Most of the ones I've tried in the past have been downright terrible, some even came with fake solar panels (yes, really) or solar panels that would actually drain the battery when out of the light. The others were mediocre, with the solar panel serving as little more than a gimmick to lure in buyers.
Tony Jolliffe BBC