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Pre-stressing force exerting nailing device, has long nut coaxially arranged with nail, supporting phase contact part whose end is fixed with force bracket, and jack whose end is in contact with forcing screw. 专利
申请日期: 2018-01-01, 公开日期: 2018-04-17
作者:  JIA J GAO R TU B CHENG L HUANG Q YA
收藏  |  浏览/下载:2/0  |  提交时间:2019/12/02
Enhancing freshwater yield in desalinating seawater and recycling dense seawater by adding antisludging agent in seawater, performing reverse osmosis, separating freshwater, removing metal ions, washing metal ion sieve, and regenerating. 专利
申请日期: 2009-01-01, 公开日期: 2009-06-24
作者:  CHENG Z MA W QIN C TIAN L WANG R YA
收藏  |  浏览/下载:2/0  |  提交时间:2019/12/24


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