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13 小時前 · Transport Layer Security ( TLS) is a cryptographic protocol designed to provide communications security over a computer network. The protocol is widely used in applications such as email, instant messaging, and voice over IP, but its use in securing HTTPS remains the most publicly visible. The TLS protocol aims primarily to provide security ...
1 天前 · Probability theory. In probability theory and statistics, a normal distribution or Gaussian distribution is a type of continuous probability distribution for a real-valued random variable. The general form of its probability density function is. The parameter is the mean or expectation of the distribution (and also its median and mode ), while ...
3 天前 · e. The Internet (or internet) [a] is the global system of interconnected computer networks that uses the Internet protocol suite (TCP/IP) [b] to communicate between networks and devices. It is a network of networks that consists of private, public, academic, business, and government networks of local to global scope, linked by a broad array of ...
13 小時前 · WeChat or Weixin in Chinese ( Chinese: 微信; pinyin: Wēixìn ( listen ⓘ); lit. 'micro-message') [a] is a Chinese instant messaging, social media, and mobile payment app developed by Tencent. First released in 2011, it became the world's largest standalone mobile app in 2018 [4] [5] with over 1 billion monthly active users.
2 天前 · The 828-metre (2,717 ft) tall Burj Khalifa in Dubai has been the tallest building since 2010. The Burj Khalifa has been classified as megatall. A diagram showing the tallest buildings as of 2024 This is a list of the tallest buildings.Tall buildings, such as skyscrapers, are intended here as enclosed structures with continuously occupiable floors and a height of at least 340 metres (1,120 ft).
2 天前 · Juneteenth, officially Juneteenth National Independence Day, is a federal holiday in the United States.It is celebrated annually on June 19 to commemorate the ending of slavery in the United States.The holiday's name is a portmanteau of the words "June" and "nineteenth", as it was on June 19, 1865, when Major General Gordon Granger ordered the final enforcement of the Emancipation Proclamation ...
1 天前 · At the turn of the 21st century, the G7 began emphasizing engagement with the developing world. At the 1999 summit, the group helped launch the G20, a similar forum made up of the G7 and the next 13 largest economies (including the European Union), in order to "promote dialogue between major industrial and emerging market countries"; the G20 has been touted by some of its members as a ...
