[多选题]下列哪些情况应紧急停炉（）

正确答案 ：ACD

DCS系统异常，无法监视时

锅炉严重满水时

炉管爆破，不能维持正常水位或灭火时

[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?（）

正确答案 ：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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