精品国产免费久久久久久,99视频九九精品视频在线观看,免费的视频网站入口,久久国内,福利视频亚洲,h小视频在线观看网

The certification of explosion-proof electrical installation and maintenance capability is issued by several institutions and can be used for construction in various explosive hazardous areas. As a professional agency for explosion-proof electrical installation, maintenance and repair qualification certificates, Zhongnuo Testing has obtained corresponding certificates for hundreds of customer enterprises. At Zhongnuo Testing, the qualification certificate for explosion-proof electrical installation, maintenance and repair is obtained through a combination of online and offline training methods. The training and examination standards are as follows:GB3836Series standards, monthly regular1-2We provide on-site training and exam arrangements, and assist in preparing the necessary documents throughout the process, which can save processing time and costs for our corporate clients. Our certificates are authentic, authoritative, and trustworthy!