在网上开展远程教学活动，需要解决两个基本问题：音频、视频流信息的传送以及它们与数据之间的同步。
Launching the distance learning activity on the net, need to solve two basic problems: Synchronism among the conveyance, they and data of audio frequency, video streaming information.
本论文的研究来源于科研项目“低比特率多媒体远程教学系统”及“基于网上的视音频监控及报警系统”。
The research in this paper is based on the projects which are "A Low Bit Rate Multimedia Remote Instruction System" and "A Video-Audio Monitoring-Control and Alarm System".
可见，答疑子系统的研发是现代远程教学的重要环节，对实现高质量的网上教学具有深远意义。
So the development and research of answering subsystem is an important part in the modern remote teaching.
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