单词	underfrequency relay
释义	underfrequency relay noun : a relay actuated by a fall in electrical frequency Word History Etymology under entry 3 + frequency
随便看	oreopteres oreopterises oreopterisses oreortyces Oreortyx oreortyxes oreos Oreotragus Oreotrochilus ores Orestes oreweeds orexises orey-eyed orfe orfes orfevrerie Orff orfgild orfray orfrays orfrey orfs org organ

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