____
offers a chance to correct user errors.
A: undo
B: redo
C: cancel
offers a chance to correct user errors.
A: undo
B: redo
C: cancel
举一反三
- Where a charter-party stated that errors of navigation were excluded，it was held that these words referred to non-negligent errors，and（）not wide enough to embrace negligent errors.
- 系统使用检查点方法进行恢复，当故障Ti发生时，以下说法（ ）正确。[img=616x197]17e0af4e3fe863e.jpg[/img] A: T2，T3执行Redo操作，T4，T5执行UNDO操作 B: T1，T2，T3执行Redo操作，T4，T5执行UNDO操作 C: T2，T4执行Redo操作，T3，T5执行UNDO操作 D: T3，T5执行Redo操作，T2，T4执行UNDO操作
- 事务的结束标志包括 A: COMMIT B: ROLLBACK C: REDO D: UNDO
- 事务故障进行恢复，首先，扫描日志文件，找出事务的更新操作，接着，对该事务的更新操作执行操作。 A: 正向，undo B: 正向，redo C: 反向，undo D: 反向，redo
- Travel offers you a chance to practice ______.