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按埋藏条件地下水分类有（）、（）、（）。

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In Recovery Manager （RMAN）， you are taking image copies of the data files of your production database and rolling them forward at regular intervals. You attempt to restart your database. After a regular maintenance task， you realize that one of the data files that belongs to the USERS tablespace is damaged and you need to recover the data file by using the image copy. Because a media failure caused the data file to be damaged， you want to place the data file in a different location while resto ing the file. Which option must you consider for this task？（）

A. using only the RMAN SWITCH command to set the new location for the data file
B. placing the database in the MOUNT state for the restore and recovery operations
C. using an RMAN RUN block with the SET NEWNAME and then the SWITCH command
D. configuring two channels： one for the restore operation and the other for the recovery operatio

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派工（dispatching）属于通常所说的调度范围。

A. 正确
B. 错误

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下列对苯甲酸与苯甲酸钠的叙述，正确的是（）

A. 防腐作用依靠苯甲酸解离的离子
B. 一般用量为0.01%～0.25%
C. 降低pH有利于其发挥防腐作用
D. pH在5以上防腐作用最好
E. pH在4以下时，用量不得少于0.5%

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社会服务站格尔发系列重型车标准工时单价为（）

A. 15元/工时
B. 18元/工时
C. 30元/工时
D. 20元/工时

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