???

DGK?????

??????????Shandong Agricultural University?????????????????????????????????

??????1997????????????????Hedong Gold Mine???????????????????????????????Shandong Zhaojin Group Co., Ltd.???????????????????????????????????????Beijing Lujin Technology Development Co., Ltd???????????????Shandong Zhaojin Geological Exploration Co.,Ltd.?????????????Shandong Zhaojin Gold & Silver Refining Co., Ltd.????????????????????????????Zhaojin Non-ferrous Mining Co., Ltd.?????

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