四虎国产成人精品免费一女五男,99久久久久久久久,日韩激情国产,91久久人澡人人添人人双人,久久免费一区,亚洲午夜电影,日韩精品黄


The large particle synthetic diamond single crystal manufacturing industry is an emerging industry. With the gradual reduction of costs and the gradual understanding of diamonds, its application range will be gradually broadened.

After years of research work, it has produced a unique product and has built a research and development team. Large single crystals are available in white, yellow and blue.