CD光盘是一种光信号存储介质,它可以存储大量的信息。目前它已在我们的生活和工作中广泛使用。我们用它记录音乐、影像或计算机程序等。它的主体是一张直径12cm,用光学级透明聚碳酸酯（PC）材料压成的很薄的盘。光盘是通过其表面的成百上干的小凹陷记录信息的,一般一张盘上可以 CD-ROM is an optical signal storage medium, it can store a lot of information. It has been widely used in our lives and at work. We use it to record music, video or computer programs. Its main body is a thin disk of 12 cm in diameter, made of optically clear polycarbonate (PC) material. Disc through the surface of hundreds of small dry depression recorded information, usually a disc can