Itọnisọna nipasẹ Ile-iṣẹ ti Awọn orisun Adayeba ti Orilẹ-ede Eniyan ti Ilu China ati Ijọba Eniyan Agbegbe Tianjin, ti gbalejo nipasẹ China Mining Federation, ati ti Tianjin Mining Expo International Exhibition Co., Ltd., 2021 (ikẹta-mẹta) Mining International China ṣe Apejọ w...
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