This paper constructs a frame of distance learning system which transfers the media data on the network base on custom streaming media.The custom media format follows the RIFF criterion,multi-video and audio can be saved as a file.The system has characteristics of lower cost,simple storage,better synchronal of multimedia courseware,better expansibility and so on.The system applies to various aspects such as distance learning,video on demand.

This paper presents a method to realize the storage and playback of multi-video and audio file..Multi-video and audio can be saved as a file and played synchronously in this method which has characteristics of lower cost,simple storage and control,better expansibility and so on.The method applies to various aspects such as video conference and realtime teaching.

Regenerated cellulose fibers have broad market prospects thanks to their advantages in terms of raw material and performance. The article introduces the worldwide development of regenerated cellulose fibers and regeneration technologies, and anticipates the future development of regenerated cellulose fibers. It points out, new regeneration technologies, such as the technologies for producing lyocell fiber and cellulose carbamate fiber as well as Celsol and wet-spinning methods, have great market potential, representing the direction for future development of regenerated cellulose fibers.