【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
Bitcoin mining is the process of adding new transactions to the Bitcoin blockchain. It’s a tough job. People who choose to mine Bitcoin use a process called proof of work, deploying computers in a race to solve mathematical puzzles that verify transactions.To entice miners to keep racing to solve the puzzles and support the overall system, the Bitcoin code rewards miners with new Bitcoins. “This is how new coins are created” and new transactions are added to the blockchain, says Okoro.
The S&P 500 slumped 1.8% on Monday and Tuesday, thanks to China Evergrande, the Chinese property company that looks like it is ready to default on its more-than $300 billion in debt. Cries of the next Lehman Brothers—or maybe the next Silverado?—echoed through the canyons of Wall Street as investors prepared for the worst.
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