1 引言 ............................................................................................................................................... 2 1 .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 ............................................................................................................................. 3 2 .3 假定和约束 ............................................................................................................................. 3 3 需求规定 ....................................................................................................................................... 4 3 .1 对功能的规定 ......................................................................................................................... 4 3 .2 对性能的规定 ......................................................................................................................... 4 3 .2 .1 精度 .................................................................................................................................. 4 3 .2 .2 时间特性要求 .......
