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Which of the following statements is true concerning all three-phase alternators?（）
A:Each has three separate but identical armature windings acted on by one system of rotating magnets
B:Each has one armature winding acted on by three identical but separate systems of rotating magnets
C:All three-phase alternators are designed to operate with a O8 leading power factor
D:The three phases always provide power to the load through three sets of slip rings and brushes

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出自：海船船员证

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