正确答案: B
Ⅰ级,Ⅱ级,Ⅲ级
题目:司炉操作人员分为()类。
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学习资料的答案和解析:
[单选题]对公称外径为Φ32-Φ42mm的管子,其外径偏差不应超过()。
B、±0.45mm
[单选题]《特种设备安全监察条例》规定,特种设备使用单位应当对在用特种设备的有关附属仪器仪表进行()、检修,并作出记录。
C、定期校验
[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?()
It backs up the data files and archived log files to tape, making two copies of each data file and archived log file