黑人最大最粗bbbbvb,免费观看一区二区三区毛片,精品国产AV色欲果冻传媒,久久久久国色αv免费观看

On June 7-9, 2017, UCT Beijing participated in the International Thermal Spraying Conference and Exposition held in Dusseldorf, Germany, during which, the company mainly focused on the promotion of its equipment, especially, the two new highlights for detonation spraying and off-line programming. The company has participated in the exposition for five years in a row.