Track quality for the engineering change parts. 對工程變更件產品的質量追蹤。
In order to overcome the influence of variation to the project goal, many people carried on to the variation control thoroughly, proposed many control measures. 為了克服工程變更對項目目標的影響，業內人士對工程變更控制進行了深入地研究，提出了許多控制措施。
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