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Trial edition of The Definition and Gradation Regulation for Natural High Selenium Land published and printed
  Publish Date: 2019-11-21    Navigation Site root>> 

    Recently, the trial edition of The Definition and Gradation Regulation for Natural High Selenium Land (DD2019-10) was authorized by China Geology Survey to be published and printed. This regulation filled the gap in the field of selenium land and provided important rules.



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