基本释义:

通常关闭

网络释义

1)NC Normally Closed,通常关闭

2)normally closed switch,常闭开关

3)ventilation shut-down device,通风关闭器

4)normally closed push button switch,常闭按钮开关

5)normally closed push button switch,常闭铵钮开关

6)rns,远置常停止或关闭开关