数据库恢复是将数据库从【4】状态恢复到某一已知的正确状态。_爱下问搜题

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问题填空题

数据库恢复是将数据库从【4】状态恢复到某一已知的正确状态。

答案

参考答案：答案：错误

解析：

[分析]：数据库恢复是将数据库中的数据从错误状态中恢复到某种逻辑一致的状态。如果数据库中包含成功事务提交的结果，则称数据库处于一致性状态。

填空题

阅读短文，从方框中选择行当的词并用其正确形式填空，使短文意思通顺、完整。请将答案写在短文后相应题号的横线上。每空限填一词，每词限用一次。方框中有两个词是多余的。

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After a quick breakfast, I went into the lecture hall in a hurry．A famous teacher was 小题1: to the students．He was holding up a $100 bill．Then he said to the three hundred students，“Who would like this $1 00 bill?” The students put up 小题2:hands at once．Then he said，“I am going to give this $100 bill to one of you，but 小题3:，let me do this．”He made the bill into a ball．Then he said. “Who小题4: it now?” The hands went back into the air．“Well,” he said，“what if I do this?” and he 小题5: it on the floor and stepped on it．He picked up the 小题6:bill and said．“Who still wants it?” Hands went back again into the air．
“My friends,” he said，“you have learned a valuable(有价值的)小题7: today．No matter what I did to the $100 bill! Many 小题8: in our life，we are dropped and stepped on．We feel as if we are worth nothing．But remember, no matter what 小题9: happened to you，you will never lose your value：You are 小题10: valuable to those people who love you．Your value doesn’t come from what you do or whom you know, but who you are．’’

判断题

实际回收率=精矿量÷原矿量100%。