日志记录在数据恢复中的作用是怎样的?
参考答案:
日志文件的作用是用来记录事务对数据库的操作的文件,以备数据恢复使用。
The successful spread of a virus depends on how long it can (74) unnoticed, before its presence is made known by the activation of side-effects. For example, many viruses (75) their code to avoid recognition.
A.move
B.replicate
C.backup
D.die out
溶液的PH值等于其氢离子浓度的()。