常开指的是在电力系统里面,标准规定,所有触点应该在自然、未通电状态下。如果两个触点是导通的,就称为常闭(NC Normally closed )。如果两个触点是断开的,就称为常开(NO Normally open )。
日常开支 daily expenses ; Day-to-day spending
常开式 Normally open type
非经常开支 non-recurrent expenditure ; Nonrecurring Charge
笑口常开 Laugh often ; Grin all the time ; Grinning all the time ; grinning all the time
常开触点 [电] normally open contact ; contact normally open ; NO contact
常开状态 normal open
经常开支 recurrent expenditure ; overhead ; operating expense ; overhead charges
常开阀 normally open valve ; NO Valve
常开接点 normally open contact ; Normally Open
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