题目内容
在烘焙“哥斯达黎加”咖啡豆时，待到锅炉温度上升至130℃时，需要将风门刻度调整至（），并做好记录。
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Operation & Maintenance is the process of modifying a software system ________, aiming to correct faults, improve performance or adapt to a changed environment.
Software requires periodic ________ to ensure it continues to run smoothly and reduce the occurrence of problems.
________is the reactive modification of a software product performed after delivery, to correct any discovered problems, such as bugs and logical errors.
This sort of maintenance ________ only about 5% of all maintenance.
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