对于额定蒸汽压力0.8MPa≤p≤5.9MPa的锅炉，其控制安全门的起始压

【名词&注释】

工作压力(working pressure)、安全门(safety door)

[单选题]对于额定蒸汽压力0.8MPa≤p≤5.9MPa的锅炉，其控制安全门的起始压力为（）倍的工作压力。

A. A、1.04
B. B、1.05
C. C、1.1
D. D、1.06

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学习资料：

[单选题]You issued the following commands to configure setting in RMAN;Then you issued the following command to take the backup:RMAN> BACKUP DATABASE PLUS ARCHIVELOG;Which statement is true about the execution of the above command?（）

A. The backup will terminate because the FORMAT clause was not configured for the channel
B. It backs up two copies of data files to tape and disk, and two copies of archived log file on tape
C. It backs up the data files and archived log files to disk, making two copies of each data file and archived log file
D. It backs up the data files and archived log files to tape, making two copies of each data file and archived log file

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