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In Recovery Manager (RMAN), you are taking image copies of the datafiles of your production database and rolling them forward as regular intervals. You attempt to restart your database instance 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 datafile by using the image copy. You could perform the following steps to accomplish this: 1) Mount the database 2) Take the data file offline 3) Bring the data file online 4) Use the RMAN SWITCH TO command to switch the image copy 5) Apply the archived redo logs 6) Open the database 7) Use the RMAN RESTORE TO command to switch to the image copy Which two options illustrate the correct sequence of steps that you could follow?（） (Choose two.)

A. 2, 6, 4, 5, 3
B. 1, 2, 4, 5, 3, 6
C. 1, 2, 4, 6, 3
D. 1, 2, 7, 5, 3, 6

下列需要进行消防设计审核和消防验收的工程是（）

A. 建筑面积二万五千平方米的公共展览馆、博物馆的展示厅
B. 建筑总面积五百五十平方米的歌舞厅
C. 建筑总面积一万二千平方米的宾馆
D. 建筑总面积九千平方米的商场

一对齿轮啮合时，两齿轮始终相切的圆是（）

A. 分度圆
B. 基圆
C. 节圆
D. 齿根圆