【多选题】【消耗次数：1】
按维护的方式可以把维护分成（）等形式
①
定期维护
②
按质维护
③
按需维护
④
事后维修
参考答案：
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相关题目
【多选题】
软件维护的内容主要包括操作维护和程序维护。操作维护主要是一些日常维护工作，程序维护包括(）。
①
正确性维护
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完善性维护
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适应性维护
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⑤
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