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对重汲水机
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00:22, 1 April 2016
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===参考文献===
[http
* [http
://www.fao.org/docrep/010/ah810e/AH810E08.htm
| 汲水机的力量],联合国粮食与农业组织
汲水机的力量.] ,联合国粮食与农业组织
===鸣谢===
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