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公历中，哪个月份的天数可能会变化？为什么？

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①由于我国旧衣回收市场还处于早期发展阶段，一些发展中的问题仍不容忽视。“不透明”是废旧纺织品尤其是废旧衣物回收源头的一大痛点。 ②旧衣回收助力资源再利用，有利于环境保护，同时商家分拣、清洗、打包、运输环节都会使用人工，创造了大量就业机会，物尽其用比白白浪费好多了。 ③旧衣回收是民生和环保所需，蕴藏着巨大的市场空间。 ④与此同时，旧衣回收行业商业模式仍未成熟，缺乏完备管理体系。谁来收、如何收等相应主体和标准尚未明确，产业链分工、配合、协调等仍有待规范和清晰。 ⑤围绕旧衣服行业的某个门类或某个产业链条，国内已经自发形成多个专业回收中心。我们扔掉的旧衣服，正撑起一个千亿级市场。 ⑥对城市中许多快节奏生活的年轻人而言，一件衣服的平均寿命并不长，大量旧衣服要么被随意丢弃，要么堆积在家中某个角落，造成极大的资源浪费。 将以上6个句子重新排序，语序正确的是（    ）
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①由于我国旧衣回收市场还处于早期发展阶段，一些发展中的问题仍不容忽视。“不透明”是废旧纺织品尤其是废旧衣物回收源头的一大痛点。 ②旧衣回收助力资源再利用，有利于环境保护，同时商家分拣、清洗、打包、运输环节都会使用人工，创造了大量就业机会，物尽其用比白白浪费好多了。 ③旧衣回收是民生和环保所需，蕴藏着巨大的市场空间。 ④与此同时，旧衣回收行业商业模式仍未成熟，缺乏完备管理体系。谁来收、如何收等相应主体和标准尚未明确，产业链分工、配合、协调等仍有待规范和清晰。 ⑤围绕旧衣服行业的某个门类或某个产业链条，国内已经自发形成多个专业回收中心。我们扔掉的旧衣服，正撑起一个千亿级市场。 ⑥对城市中许多快节奏生活的年轻人而言，一件衣服的平均寿命并不长，大量旧衣服要么被随意丢弃，要么堆积在家中某个角落，造成极大的资源浪费。 将以上6个句子重新排序，语序正确的是（    ）

②旧衣回收助力资源再利用，有利于环境保护，同时商家分拣、清洗、打包、运输环节都会使用...
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Ancient Roman empire had a strong government system with various departments, including a secret service department. Important documents were sent between provinces and the capital in encrypted form to prevent eavesdropping. The most popular ciphers in those times were so called substitution cipher and permutation cipher. Substitution cipher changes all occurrences of each letter to some other letter. Substitutes for all letters must be different. For some letters substitute letter may coincide with the original letter. For example, applying substitution cipher that changes all letters from ‘A’ to ‘Y’ to the next ones in the alphabet, and changes ‘Z’ to ‘A’, to the message “VICTORIOUS” one gets the message “WJDUPSJPVT”.  Permutation cipher applies some permutation to the letters of the message. For example, applying the permutation ⟨2, 1, 5, 4, 3, 7, 6, 10, 9, 8⟩ to the message “VICTORIOUS” one gets the message “IVOTCIRSUO”. It was quickly noticed that being applied separately, both substitution cipher and permutation cipher were rather weak. But when being combined, they were strong enough for those times. Thus, the most important messages were first encrypted using substitution cipher, and then the result was encrypted using permutation cipher. Encrypting the message “VICTORIOUS” with the combination of the ciphers described above one gets the message “JWPUDJSTVP”.  Archeologists have recently found the message engraved on a stone plate. At the first glance it seemed completely meaningless, so it was suggested that the message was encrypted with some substitution and permutation ciphers. They have conjectured the possible text of the original message that was encrypted, and now they want to check their conjecture. They need a computer program to do it, so you have to write one. 
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Ancient Roman empire had a strong government system with various departments, including a secret service department. Important documents were sent between provinces and the capital in encrypted form to prevent eavesdropping. The most popular ciphers in those times were so called substitution cipher and permutation cipher. Substitution cipher changes all occurrences of each letter to some other letter. Substitutes for all letters must be different. For some letters substitute letter may coincide with the original letter. For example, applying substitution cipher that changes all letters from ‘A’ to ‘Y’ to the next ones in the alphabet, and changes ‘Z’ to ‘A’, to the message “VICTORIOUS” one gets the message “WJDUPSJPVT”.  Permutation cipher applies some permutation to the letters of the message. For example, applying the permutation ⟨2, 1, 5, 4, 3, 7, 6, 10, 9, 8⟩ to the message “VICTORIOUS” one gets the message “IVOTCIRSUO”. It was quickly noticed that being applied separately, both substitution cipher and permutation cipher were rather weak. But when being combined, they were strong enough for those times. Thus, the most important messages were first encrypted using substitution cipher, and then the result was encrypted using permutation cipher. Encrypting the message “VICTORIOUS” with the combination of the ciphers described above one gets the message “JWPUDJSTVP”.  Archeologists have recently found the message engraved on a stone plate. At the first glance it seemed completely meaningless, so it was suggested that the message was encrypted with some substitution and permutation ciphers. They have conjectured the possible text of the original message that was encrypted, and now they want to check their conjecture. They need a computer program to do it, so you have to write one. 

区块链毕设网qklbishe.com为您提供问题的解答 Ancient Roman ...
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