【正文】 ..................................................................................................................6 產(chǎn)品描述 .............................................................................................................................................6 產(chǎn)品功能 .............................................................................................................................................73. 功能性需求分類 ...................................................................................................................................................................8 系統(tǒng)數(shù)據(jù)流圖（DFD） .....................................................................................................................8 學校教材購銷系統(tǒng) DFD....................................................................................................................8 學校教材購銷系統(tǒng)一級數(shù)據(jù)流圖 ...................................................................................................10 學校教材購銷系統(tǒng)二級數(shù)據(jù)流圖 ...................................................................................................11 功能描述 1 ......................................................................................................................................12 功能描述 2 ......................................................................................................................................13 輸入項目 ..........................................................................................................................................13 輸出項目 ........................................................................................................................................134. 產(chǎn)品的非功能性需求 .......................................................................................................................................................13 外部接口說明 ....................................................................................................................................13 用戶接口 ........................................................................................................................................13軟件需求規(guī)格說明書PAGE 6 OF 26 軟件接口 ........................................................................................................................................13 性能需求 ...........................................................................................................................................13 硬件的限制 ....................................................................................................................................14