单选题Which of the listed sections of an emergency switchboard is used to supply power for alarm signals under emergency conditions?（）AThe generator and bus transfer sectionBThe 450 volt, 60 cycle, 3 phase busCThe 120 volt, 3 phase, 60 cycle busDThe 24 volt DC bus
单选题
Which of the listed sections of an emergency switchboard is used to supply power for alarm signals under emergency conditions?（）
A
The generator and bus transfer section
B
The 450 volt, 60 cycle, 3 phase bus
C
The 120 volt, 3 phase, 60 cycle bus
D
The 24 volt DC bus
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