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.
课件是远程教学中的一种资源，如何利用网络技术，实现课件的制作与网上教学应用，是实施远程教学的一项基本内容。
Courseware is a resource of remote teaching. How to use network technique to design courseware and to implement the application of courseware is one of the basic content to actualize remote teaching.
通过网上教学等先进模式，提供远程教学。
Through the Internet teaching mode, providing advanced teaching.
通过网上教学等先进模式，提供远程教学。
Through the Internet teaching mode, providing advanced teaching.
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