Evaluare: 4 din 5 stele
4/5
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author
Xiaozhen Sun
Sun Xiaozhen, is the director of Safety and Environmental Protection Supervision Center of Xinjiang Oilfield Company. He is a senior drilling engineer and has been granted with the certificates of ...vizualizați mai multeSun Xiaozhen, is the director of Safety and Environmental Protection Supervision Center of Xinjiang Oilfield Company. He is a senior drilling engineer and has been granted with the certificates of national first-class registered safety assessment engineer and national registered safety engineer.vizualizați mai puține