单选题Some large A-Cmotors are equipped with heatersThese could be （） (1)resistance heaters bolted directly to the frame (2)low voltage windings embedded in the motor windingsA(1) onlyB(2) onlyCeither (1) or (2)Dneither (1) or (2)
单选题
Some large A-Cmotors are equipped with heatersThese could be （） (1)resistance heaters bolted directly to the frame (2)low voltage windings embedded in the motor windings
A
(1) only
B
(2) only
C
either (1) or (2)
D
neither (1) or (2)
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