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deep shaft sinking technique in ancient China
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deep shaft sinking technique in ancient China
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工学
中国古代深井开凿技术
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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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