normal close
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控制形式：标准常闭、常开、双作用。
Control type: normally closed, normally open, double acting.
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通常分为常开型，常闭型和自保持式三种。
Usually divided into normally open, normally closed and self-holding three.
机械压力开关，1个常闭点常开点，正表压。
Mechanical pressure switch, 1 nc, no, positive gauge pressure.
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