... pipe oxygen unit 管输氧气组合 piped oxygen 管输氧气 pipework 喉管 ...
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piped oxygen system 管输氧气系统
piped oxygen unit 管输氧气组合
·2,447,543篇论文数据，部分数据来源于NoteExpress
Managers said the special rooms will have small amounts of nitrogen piped into them to reduce the oxygen content in the air, so fires cannot start.
BBC: 'Fire-free' rooms at Birmingham library protect archive
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