CNOOC qualified supplier qualification
CNOOC contractor HSE prequalification certificate
PetroChina Changqing Oilfield Branch,Product Quality Registration Certificate
ISO 9001: 2015认证证书
ISO 14001: 2015 certificate
BS-OHSAS 18001: 2007 certificate
Shaanxi serves famous brand certificates
Quality, service integrity unit certificate - AAA level
Credit rating certificate - AAA level