成人交性视频免费看_日韩欧美亚洲综合久久影院_五十老熟妇乱子伦免费观看_国产产区一二三产区区别在线_国内精品伊人久久久久AV一坑_国产亚洲欧美日韩二三线

					Customer issues within 24 hours to answer, e-mail reply within 24 hours, customer complaints processed within 48 hours, working hard, timely, accurate, warm service.

					Sapphire unique nature determine its widely used, but high-quality sapphire is difficult to get. As we know, sapphire seed crystal growth has a direct impact, but have become a key factor to grow high quality crystals

					Sapphire surface defects and dislocations seriously affect the quality of crystal growth of subsequent epitaxial layers, thus affecting the LED luminous efficiency and lifetime.

					PL detection system can monitor all processes in the solar cell manufacturing and gives accurate analysis possibility to the technology problems.