桩机更换钻杆、钻头（钻锤）或放置钢筋笼、接导管时，应采取措施防止物件（）。

An incremental backup strategy will be used automatically.
B. Read-only datafiles will not be backed up as long as backups of those files already exist and those backups meet established retention criteria.
C. RMAN will configure itself for maximum performance at the cost of CP
D. RMAN will configure itself for minimal OS/CPU impact at the cost of time to back up the database.
E. RMAN will automatically compress backups.

A. 在控制面板中选择“显示”
B. 在“任务栏和「开始」菜单属性”的“「开始」菜单”中选择“经典「开始」菜单”，点击“确定”
C. 在桌面上单击右键，选“属性”
D. 在任务栏上单击右键，选“属性&rdquo