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航运联盟

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Your PROD database has been started using the server parameter file. In your PROD database you are using RMAN for backup and recovery operations. You issue the following commands from the RMAN prompt: RMAN> CONFIGURE CONTROLFILE AUTOBACKUP OFF; RMAN> BACKUP DATABASE; Which files from the database will be backed up as a result of this BACKUP command?()

A. control file
B. all datafiles
C. password file
D. online redo log file
E. archive redo log file
F. server parameter file
G. only the SYSTEM datafile

试述阴极保护法的防腐原理是什么?

对零件清理和清洗的重要作用是()。

A. 提高装配质量
B. 降低装配效率
C. 减少装配人员
D. 减少装配工艺过程

当土壤速效磷含量在()mg/kg水平下表示土壤有效磷缺乏

A. >20
B. 10---20
C. <10

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