What are the prerequisites for enabling Flashback Database？ （） [" The database must be started in the MOUNT EXCLUSIVE state."," The database must have multiplexed control files."," The database must be opened by using a text-based parameter file instead of a server parameter file （SPFILE）."," The database must be in ARCHIVELOG mode."," The database must be in the NOMOUNT state."," The database must be opened in RESTRICTED mode."]
大口径开孔作业时，开孔刀具转速一般控制在（）内。 ["可控范围内","规定范围","标准范围","企业规定范围"]
The persistent configuration settings for RMAN have default for all parameters.Identify four RMAN commands that produce a multi-section backup.（） [" BACKUP TABLESPACE SYSTEM SECTION SIZE 100M;"," BACKUP AS COPY TABLESPACE SYSTEM SECTION SIZE 100M;"," BACKUP ARCHIVELOG ALL SECTION SIZE 25M;"," BACKUP TABLESPACE "TEMP" SECTION SIZE 10M;"," BACKUP TABLESPACE "UNDO" INCLUDE CURRENT CONTROLFILE SECTION SIZE 100M;"," BACKUP SPFILE SECTION SIZE 1M;"," BACKUP INCREMENTAL LEVEL 0 TABLESPACE SYSAUX SECTION SIZE 100M"]
活塞移动能达到的最上端位置称为（），此时活塞距离曲轴的旋转中心（）。
Which statement is true regarding virtual private catalogs？（） [" A virtual private catalog owner can create a local stored script， and have read\/write access to a global stored script."," The virtual private catalog owner cannot create and modify the stored scripts."," The set of views and synonyms that make up the virtual private catalog is stored in the schema of the RMAN recovery catalog owner."," To perform most of the RMAN operations， the virtual catalog owner must have the SYSDBA or SYSOPER privilege on the target database."]
公交客流调查的方法有：问询法、（）、填表发、凭证法和机票发等。根据观测地点不同，观测调查可以分为（）、随车观测法和驻站观测法。
