多选题
AA backup of the target database when it is mounted
BA backup of online redo log files when the database is open
CA backup of only used data blocks in the file beingbeingbackup up
DA backup of online， read/write data files when the database is open
EA backup of only those data blocks that have changed since a previous backup
FA backup of online， read/write data files when the database is in the NOMOUNT state.
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答案解析
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