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堆石透水坝
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05:44, 22 September 2015
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===成本===
一座为2至2.
5公顷土地控制侵蚀和供水的典型石坝需要500至650美元建材运输费,约300至600人力工作日。
5公顷土地控制侵蚀和供水的典型石坝需要500至650美元建材运输费,约300至600人工日。
===实地经验===
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