摘要:三相电源(three-phase sources)能同时提供三个频率相同、初相位互异的电源。注：（1）三相发电机就是一种常用的三相电源。
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balanced three-phase sources 对称三相电源
Three phase variable-frequency power sources 三相变频电源
Sources say the raid was phase one of a three-part operation.
NPR: Attacking Al-Qaida In Pakistan
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