...NC是常关闭，是英文Normally Close（正常关闭）缩写。 常开 一般接触器触头位置都会标注常开NO、常闭NC以及所对应的数字，不同厂家的标注方式也不同，最常见的如：常开触点（NO...
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... 开启后加锁(锁开) Locked closed L.O 正常时关闭 Normally close N.C 正常时开启 Normally open N.O ...
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normally close valve 常闭阀
NC NORMALLY CLOSE 正常闭合
The American pressure on Mr Netanyahu has strained normally close Israel-US ties.
BBC: Israel-US settlement deal 'close'
It meant equipment that would normally automatically close the barriers had been switched off and was being operated manually by an attendant at the crossing.
BBC: Ufton Nervet level crossing
Wildlife experts have said the sighting of the normally-shy deer so close to a built-up area is "extremely rare".
BBC: 'Shy' deer with sheep near homes in Lancashire
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