1746-IA4/1746-IA4 AB濃度限值： 20計(jì)數(shù)/毫升@ 5％重合誤差
外殼： 聚丙烯，白
樣品入口/出口連接： 1/4“擴(kuò)?
樣品溫度： 50 - 140°F（10 - 60°C）
1746-IA4/1746-IA4 AB
1746-IA4/1746-IA4 AB
測量與分析更加詳細(xì)地規(guī)定了對于能夠證明過程的文檔的采集和存儲方法，而且需要對采集數(shù)據(jù)匯總后進(jìn)行統(tǒng)計(jì)分析，將分析結(jié)果，如偏差、趨勢、錯誤數(shù)目等展示給項(xiàng)目組成員和高層，由他們進(jìn)行項(xiàng)目開發(fā)的決策。
項(xiàng)目監(jiān)控是手段，測量與分析為輔助，需求管理則是zui終目的。結(jié)合圖1，需求在整個(gè)軟件研制周期內(nèi)不可能是一成不變的，是逐步細(xì)化的。用戶需求是*步，隨后軟件研制任務(wù)書將用戶需求工程化，需求規(guī)格說明對任務(wù)書的需求細(xì)化，設(shè)計(jì)說明對需求規(guī)格說明的需求細(xì)化，軟件源代碼將設(shè)計(jì)說明對應(yīng)到代碼。單元測試、集成測試、系統(tǒng)測試是對細(xì)化后的需求進(jìn)行回歸。根據(jù)GJB438B-2009中的《軟件需求規(guī)格說明》模板，需求包括10類技術(shù)需求和4類非技術(shù)需求。非技術(shù)類需求一般可以得到客觀保證，因此不會出現(xiàn)大的變動，可以暫不納入需求跟蹤矩陣。技術(shù)需求由于項(xiàng)目研制情況會出現(xiàn)變化，需要納入需求跟蹤矩陣進(jìn)行管理，確保軟件工作產(chǎn)品巾需求能夠進(jìn)行雙向追溯。一旦需求變更狀況時(shí)，及時(shí)記錄并且上報(bào)整個(gè)項(xiàng)目組，獲得項(xiàng)目組的*認(rèn)可。
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