单选题Which of the following devices are protected from being motorized by a reverse-power relay?（）AAlternatorsBWave guidesCExcitersDAmplidynes
单选题
Which of the following devices are protected from being motorized by a reverse-power relay?（）
A
Alternators
B
Wave guides
C
Exciters
D
Amplidynes
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解析：
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