问题
填空题
计算机系统安全包括三个方面：秘密性、完备性和______。
答案
参考答案：可用性
解析： 计算机系统安全有以下三个方面：秘密性、完备性和可用性。秘密性是指系统资源只允许授权的用户进行操作；完备性是指系统资源只允许合法的用户进行修改；可用性是指合法的用户可以随时使用全部系统资源。
搜题请搜索小程序“爱下问搜题”
计算机系统安全包括三个方面：秘密性、完备性和______。
参考答案：可用性
解析： 计算机系统安全有以下三个方面：秘密性、完备性和可用性。秘密性是指系统资源只允许授权的用户进行操作；完备性是指系统资源只允许合法的用户进行修改；可用性是指合法的用户可以随时使用全部系统资源。
Anna and Jane had tickets for a pop concert in London. They were very excited about the concert. They had planned their day in London very carefully. They worked out which trains to catch, where to eat and where they wanted to go shopping. 小题1:. A friend of Jane’s was working with the sound equipment backstage（后台）. He said he could get them special passes so they could go backstage. He promised to ask the group if the girls could come to say “Hello”. He said that he was sure he could get them the group’s autographs（签名）.小题2: Then two days before the concert, Anna got a cold.小题3:, even though she stayed in bed and took medicine. On the evening before the concert, she had a fever and was very sick indeed. Anna’s mother rang Jane. “Anna is too sick to go to the concert,” she said. “You had better find someone else to go with.” The next day, Anna was feeling very sorry for herself. Then she had a visitor. It was Jane! She came with a big bag of fruit and a pile of their favorite CDs. “I’ll give the tickets to Jill and Sue in the end,” she said. “小题4: . It wouldn’t be much fun without you.”
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