久久精品成人免费国产片-亚洲在av人极品无码网站-纯肉无遮挡h肉动漫在线观看3d-小少妇ASS浓PICS


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.