英语词汇“roughing pump”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

　

单词	roughing pump
释义	Definition of roughing pump in English: roughing pump noun A pump for evacuating a system from atmospheric pressure to a lower pressure at which a second pump can begin to operate. Origin Early 20th century; earliest use found in U.S. Patents. Definition of roughing pump in US English: roughing pump noun A pump for evacuating a system from atmospheric pressure to a lower pressure at which a second pump can begin to operate. Origin Early 20th century; earliest use found in U.S. Patents.
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更新时间：2024/12/22 23:54:59