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	pull through pull together pull toy pull up pull up a chair pull up short pull up stakes pull wires pull-down pull-down menu pull-in torque pull-out torque pull-through torque pull-up pull-ups pull/yank someone's chain pullable pullback pullbacks pullboat pulldevil pulldoo pulled pulled a face pulled ahead

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