单选题（） systems are provided with a stand-by device which will automatically be put in use in the even of the running device failing through a fault condition.AAlarmBMonitoringCAuto start-upDNone of the above
单选题
（） systems are provided with a stand-by device which will automatically be put in use in the even of the running device failing through a fault condition.
A
Alarm
B
Monitoring
C
Auto start-up
D
None of the above
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