“railway tunnel maintenance”的概念、定义、翻译、参考文献-科学参考

单词	railway tunnel maintenance
释义	railway tunnel maintenance Encyclopedia 工学﹝铁路工务养护维修﹞释 railway tunnel maintenance铁路隧道养护维修对铁路隧道主要结构和附属设施（拱墙结构、隧底结构、防排水设施、附属洞室、洞室门、洞门结构等）进行的检查、养护、维修和大修。
随便看	activity constant activity curriculum activity decay activity density relative to surface activity determining method by vapor pressure measurement activity diagram activity factor activity index activity life expectancy，ALE Activity Memorial Photographic activity meter activity metrology technology by energy spectrum method activity of the waves activity-on-arrow network diagram activity on edge network activity on edge network, AOE activity on node network diagram activity on vertex network activity on vertex network, AOV activity product constant activity product of water activity profile activity ratio Activity Relationship Chart activity-sensing equipment

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