题目内容

Whichofthelistedsectionsofanemergencyswitchboardisusedtosupplypowerforalarmsignalsunderemergencyconditions?（）

A. Thegeneratorandbustransfersection
B. The450volt,60cycle,3phasebus
C. The120volt,3phase,60cyclebus
D. The24voltDCbus

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