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（）维护是花费成本最高的
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软件系统投入使用后，总投资额度为10万元，经过2年后开始产生效益，2年后每年的效益为5万元，每年的运行成本为2万元，求投资回收期为（）年。
l in the blanks with the words in the box. Change the form where necessary.evilcrueltwiststing1.How can you be so ______ to someone who never did you any harm?2.The struggle between good and _______ will never stop.3.Her words _______ his pride and his heart sank all of a sudden.4.He’s always trying to _______ my words and make me look bad.
Fill in the blanks with the words in the box.poseassumeemergeexplore1. It is so difficult to ________ the bottom of the ocean because some parts are very deep.2. It was about 30 seconds before Alex _________ from the water; we were quite scared.3. We often ________ that when other people do the same things as we do, they do them for the same reasons; but this assumption is not always reasonable.4. There is widespread concern that the rising unemployment may _____ a threat to social stability.
用高级程序设计语言编写的程序称为()。
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