题目内容

在顺序加工一批工件中，有些误差是按照某一较明显规律逐渐变化的，这类误差称随机误差。（误差分析）

A. 正确
B. 错误

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Your database is running in ARCHIVELOG mode,and the database is open. You execute an RMAN backup and specify the KEEP clause.Which components are backed up when this option is specified?（）

A. only the control file, the current SPFILE, and data files
B. only the current SPFILE and data files if autobackup is disabled
C. only the data files and the archived redo logs
D. the control file, current SPFILE file, data files, and archived redo log

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