单选题AC and DC generators are similar in that they （）Aboth generate alternating voltagesBboth rectify the voltage before deliveryCare constructed at the same physical size for the same kilowatt ratingDboth supply three-phase power
单选题
AC and DC generators are similar in that they （）
A
both generate alternating voltages
B
both rectify the voltage before delivery
C
are constructed at the same physical size for the same kilowatt rating
D
both supply three-phase power
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