“主井”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	主井
释义	主井 main shaft
随便看	ratio of diameters of flange ratio of discounted net benefit to cost ratio of division ratio of drawing ratio of elongation ratio of equality ratio of exchange ratio of expansion ratio of expenses to sales ratio of exploitation and reserve ratio of external standard ratio of first-grade products ratio of floating particles ratio of flow to mean flow ratio of Food to Microorganism ratio of forging reduction ratio of gain ratio of gate-to-pin ratio of gear ratio of generating functions ratio of gold and silver ratio of greater inequality ratio of grinding media to material ratio of gross profit to net sales ratio of gross to tare weight