【中国私企火箭发动机】
中国航天私企蓝箭航天公司的技术人员正在组装「天鹊A」液氧甲烷发动机，浙江湖州。「天鹊A」发动机是蓝箭航天公司自主研制的新一代液氧甲烷火箭发动机，分为12A、13A 和15A 三个型号，最大真空推力达85吨，主要用于朱雀二号商业运载火箭的动力系统，可实现燃烧无积碳和重复使用。这款火箭发动机已进入批量生产和交付阶段，预计2024年产量达到100台。 source
BY 每日环球视野
Telegram’s stand out feature is its encryption scheme that keeps messages and media secure in transit. The scheme is known as MTProto and is based on 256-bit AES encryption, RSA encryption, and Diffie-Hellman key exchange. The result of this complicated and technical-sounding jargon? A messaging service that claims to keep your data safe.Why do we say claims? When dealing with security, you always want to leave room for scrutiny, and a few cryptography experts have criticized the system. Overall, any level of encryption is better than none, but a level of discretion should always be observed with any online connected system, even Telegram.
The SSE was the first modern stock exchange to open in China, with trading commencing in 1990. It has now grown to become the largest stock exchange in Asia and the third-largest in the world by market capitalization, which stood at RMB 50.6 trillion (US$7.8 trillion) as of September 2021. Stocks (both A-shares and B-shares), bonds, funds, and derivatives are traded on the exchange. The SEE has two trading boards, the Main Board and the Science and Technology Innovation Board, the latter more commonly known as the STAR Market. The Main Board mainly hosts large, well-established Chinese companies and lists both A-shares and B-shares.
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