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相比研发人员规模，不同行业的平均值变动没有明显的规律—— 共有25 个行业的平均值下滑，占比超过半数，当中既有通信传输设备业、消费电子及电气业这类高速增长行业，也有教育、房地产业等相对低迷产业。
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For decades, Linux kernel developers used Pretty Good Privacy (PGP) to identify developers and their release artifacts. Git's PGP integration enabled signed tags to verify code repository integrity and signed commits to prevent hackers from impersonating legitimate developers.
It was not supposed to be used until they got to the Moon. It had no heat shield, so could not be used to re-enter the Earth's atmosphere. But it could keep them alive until they got there.