You are managing a 24*7 database. The backup strategy for the database is to perform user-managed backups. Identify two prerequisites to perform the backups.()
A. The database must be opened in restricted mode.
B. The database must be configured to run in ARCHIVELOG mode.
C. The tablespaces are required to be in backup mode before taking the backup.
D. The tablespaces are required to be in read-only mode before taking the backu
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屋面防水卷材平行屋脊的卷材搭接缝,其方向应()
A. 顺流水方向
B. 垂直流水方向
C. 顺年最大频率风向
D. 垂直年最大频率风向
在既有线上增设道岔或换铺道岔,适合采用的铺设方法有()。
A. 原位组装铺设
B. 低位组装预铺
C. 机械分段铺设
D. 侧位预铺铺入