normallyadv.通常；正常地normally closed relay常闭继电器normally opened relay常开继电器normally on transistor正常导通晶体管normally danger system正常危险制; 正常危险系统normally deformed band正常形变转动带normally open contacts常开接触器normally close d valve常关阀normally closed switch常闭开关normally open contactor常开接触器normally closed contact常闭触点