选择题：The frequency of an alternator at a given r／min is determined by the _______ .A.number of

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题目类型：选择题
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题目内容：

The frequency of an alternator at a given r/min is determined by the _______ .

A.number of turns of wire in the armature coil

B.number of magnetic poles

C.strength of the magnets used

D.output voltage

参考答案：

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