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钻井或挖掘井
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09:49, 19 October 2015
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Acknowledgements
<br>
===
Acknowledgements
鸣谢
===* [http://www.unicef.org/wash/files/04.pdf
Understanding Groundwater and Wells in Manual Drilling
理解人工钻井和地下水
]. Unicef.org.
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Weichen Chen
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