“原口道”的概念、定义、翻译、参考文献-科学参考

科学参考收录了1248194条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。

单词	原口道
释义	原口道 primary stomodaeum
随便看	sight feed body sight feed glass base sight-feed indicator sight feed lubricator sight-feed lubricator sight feed nozzle sight feed oil cup sight feed oiler sight feed siphon lubricator sight-feed tube sight fire control sight flow indicator sight for sag sight gauge sightglass sight glass sight glass for powder material sight glass for vacuum equipment sight glass shield sight glass with covering sight glass with nozzle sight glass without nozzle sight glass with scraping device sight glass with washing device sight graduation