1 引言...............................................................................................................................................21.1 编写目的 ................................................................................................................................ 2 1 。 2 背景 ..................................................................................................................................... 2 1 。 3 定义 ..................................................................................................................................... 2 1.4 参考资料 ................................................................................................................................ 3 2 任务概述 ....................................................................................................................................... 3 2.1 目标 ........................................................................................................................................ 3 2.2 用户的特点 ............................................................................................................................. 5 2.3 假定和约束 ............................................................................................................................. 5 3 需求规定 ....................................................................................................................................... 5 3.1 对功能的规定 ......................................................................................................................... 5 3.2 对性能的规定 ......................................................................................................................... 5 3 。 2.1 精度 ............................................................................................................................... 6 3.2.2 时间特性要求 ................................
