...I sent a e-mail to you ? 发给您的电子邮件 copy density ? 复制密度 on a sunday morning,i was driving down a road and saw something i couldn't believe ? 在一个星期天的早晨，我被压低的道路，...
The invention can realize the nondestructive copy, extend the operating life of the master C. D. and selecting the large numerical aperture to meet the requirement for copying C. D. with high density.