题目内容
Software requires periodic ________ to ensure it continues to run smoothly and reduce the occurrence of problems.
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________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.
The famous Chinese saying “___________” tells us that we need to maintain the software before there is really something wrong with it.
达到静平衡的刚性回转件，其质心 位于回转轴线上。
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