“deep shaft sinking technique in ancient China”的概念、定义、翻译、参考文献-科学参考

单词	deep shaft sinking technique in ancient China
释义	deep shaft sinking technique in ancient China Encyclopedia 工学中国古代深井开凿技术释 deep shaft sinking technique in ancient China中国古代深井开凿技术中国古代开凿深井，主要用于开采井盐卤水，称盐井；后来发展到开采天然气，称火井。
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