说明：  1 前言 2 2 需求分析 2 2．1原理 2 2．2要求 2 2．3任务 2 3 概要设计 3 3．1实现功能 3 3．2抢答器的组成框图 3 4 详细设计 4 4．1抢答电路设计 4 4．2定时电路设计 5 4．3报警电路设计 6 4．4抢答器控制电路设计 6 5 课程设计的总结与体会 8 6 致谢 8 7 参考资料 8
(1 Introduction 22 needs analysis 22.1 Principle 22.2 tasks requested 22.3 Summary 23 features designed to achieve 33.2 Answer 33.1 s composed of 34 detailed design diagram 44.1 Answer 44.2 timing circuit design circuit design 54 .3 Answer 64.4 alarm circuit design control circuit design of 65 courses designed to sum up experience of 86 and 87 references Thanks 8)