黄片免费视频,色月婷婷,一本久久精品一区二区,国产精品无码一区二区三级

At the annual thermal spraying conference held in the Guiyang city of China in September 2016, Dr. Arseenko, a beautiful lady from Russia, made an introduction on behalf of Beijing UCT to the excellent performances of its UDS-200 detonation gun spraying equipment. Dr. Arseenko who collaborates with UCT is a member of a foreign team engaged in the research and development work of detonation spraying technologies.