文献月刊Monthly Document
第2026年04月期Issue 2026-04
2025年北京市海淀区小学语文六下期末试卷(空白与答案版)
2025年北京市海淀区小学语文六年级下学期期末试卷(空白与答案版)，试卷里面的题目材料基本上是当下相关的，包括作文都是跟AI主题相关。这是小学六年学习阶段最后一次的期末考试，即将要升入初中阶段学习。
查看详情 →View Detail →2026年北京市朝阳区六上数学抽测试卷(空白版)
2026年北京市朝阳区六年级上学期数学抽测试卷(空白版)，数学题目材料基本上都是文字比较的现实事情，阅读量不小，有些题目还有两道弯的解题要求。
查看详情 →View Detail →2026年北京市朝阳区六上语文抽测试卷(空白版)
2026年北京市朝阳区六年级上学期语文抽测试卷(空白版)，阅读理解题中的文字材料字数不少，对学生阅读速度要求明显提升了，文章理解也有一定的难度。
查看详情 →View Detail →Bitcoin: A Peer-to-Peer Electronic Cash System
A purely peer-to-peer version of electronic cash would allow online payments to be sent directly from one party to another without going through a financial institution. Digital signatures provide part of the solution, but the main benefits are lost if a trusted third party is still required to prevent double-spending. We propose a solution to the double-spending problem using a peer-to-peer network. The network timestamps transactions by hashing them into an ongoing chain of hash-based proof-of-work, forming a record that cannot be changed without redoing the proof-of-work. The longest chain not only serves as proof of the sequence of events witnessed, but proof that it came from the largest pool of CPU power. As long as a majority of CPU power is controlled by nodes that are not cooperating to attack the network, they'll generate the longest chain and outpace attackers.
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