Optical disc is an object that uses optical information as the storage carrier to store data. Erasable optical disk, such as CD-ROM, DVD-ROM, etc. And erasable optical disk such as CD-RW and DVD-RAM.

laser record

New meaning

Action to promote thrift.

The "CD Action" advocates strict economy, opposes extravagance and waste, and drives everyone to cherish food and eat all the food on the plate. With the support of the central government and the people, it became one of the top ten news hot words and online hot words in 20 13 and one of the most famous public welfare brands.