A、(1) only
B、(2) only
C、either (1) or (2)
D、neither (1) or (2)
更多“ Some large A-Cmotors are equipped with heatersThese could be （）<br /> (1)resistance heaters bolted directly to the frame<br /> (2)low voltage windings embedded in the motor windings”相关的问题
A、have been largely achieved B、have largely not been achieved C、have been achieved in some significant areas D、have not been achieved at all
A、complicated circumstances B、changeable atmospheric pressure C、large density of traffic D、some strong signals from unwanted satellites
A、reduce wear on the valve stem B、permit the use of alloy valve seat materials C、reduce heat transfer from the valve seat D、facilitate valve removal for servicing
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