- nc normally closed
- 常态: normal condition
- 封闭: seal off; seal
- 常闭: normal close
- 常态封闭: nc normally closed
- 常闭: normal close◇常闭触点 normally closed contact; 常闭阀 normally closed valve; 常闭控制元件 normally closed control element; 常闭选通电路 normal closed gate; 常闭状态 normally off
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