问题 填空题

数据库恢复通常基于数据备份和 【20】

答案

参考答案:日志文件

解析: 日志文件在数据库恢复中起着非常重要的作用,它能够很好地支持事务故障的恢复和系统故障的恢复,所以数据库恢复通常基于数据备份和日志文件。

选择题
单项选择题

The following questions present a sentence, part of which or all of which is underlined. Beneath the sentence, you will find five ways of phrasing the underlined part. The first of these repeats the original; the other four are different. If you think the original is best, choose the first answer; otherwise choose one of the others.

These questions test correctness and effectiveness of expression. In choosing your answer, follow the requirements of standard written English; that is, pay attention to grammar, choice of words, and sentence construction. Choose the answer that produces the most effective sentence; this answer should be clear and exact, without awkwardness, ambiguity, redundancy, or grammatical error.

The eighteenth-century author Jonathan Swift once suggested in a satiric essay Irish farmers could eat their children to address the twin problems of overpopulation and lack of food.()

A. Irish farmers could eat their children to address the twin problems of overpopulation and lack of food

B. that the twin problems of overpopulation and lacking food could be addressed by the eating of children by Irish farmers

C. of the twin problems of Irish farmers, overpopulation and a lack of food, could be addressed by the eating of their children

D. that Irish farmers could address the twin problems of overpopulation and lack of food by eating their children

E. that Irish farmers, facing overpopulation and lacking food, could address the twin problems through eating their children