Évaluation : 4 sur 5 étoiles
4/5
Chargement
XS![]()
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 ...voir plusSun 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.voir moins