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VCD

DVD

MP3

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1.	What's the DVD？
2.	DVD laser corrosion?
3.	What is called the level cut? Cut in plate where?
4.	Audio frequency and video frequency why not synchronization?
5.	The plate piece marks Du to compare the numeral. Why do I obtain am 2 sound tracks surround the audio frequency?
6.	What is by line scan DVD player?
7.	Is the VCD audio frequency form is MP3?
8.	Why engraves VCD which records not to be able to broadcast?
9.	General breakdown removing
10.	DVD, VCD dustproof method