1746-IA4/1746-IA4 AB濃度限值： 20計數(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?
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)匯總后進行統(tǒng)計分析，將分析結(jié)果，如偏差、趨勢、錯誤數(shù)目等展示給項目組成員和高層，由他們進行項目開發(fā)的決策。
項目監(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，需求在整個軟件研制周期內(nèi)不可能是一成不變的，是逐步細化的。用戶需求是*步，隨后軟件研制任務書將用戶需求工程化，需求規(guī)格說明對任務書的需求細化，設計說明對需求規(guī)格說明的需求細化，軟件源代碼將設計說明對應到代碼。單元測試、集成測試、系統(tǒng)測試是對細化后的需求進行回歸。根據(jù)GJB438B-2009中的《軟件需求規(guī)格說明》模板，需求包括10類技術需求和4類非技術需求。非技術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。技術需求由于項目研制情況會出現(xiàn)變化，需要納入需求跟蹤矩陣進行管理，確保軟件工作產(chǎn)品巾需求能夠進行雙向追溯。一旦需求變更狀況時，及時記錄并且上報整個項目組，獲得項目組的*認可。
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