常开

• One external alarm , it can be set to 5 modes : always open
  有一路外部告警，可设置成常开常开锁定常闭常闭锁定或禁用。
• One outside alarm input , it can be set to 5 modes : always open
  ：有一路外部告警，可设置成常开常开锁定常闭常闭锁定或禁用。
• One external alarm input , it can be set to 5 modes : always open
  ：有一路外部告警，可设置成常开常开锁定常闭常闭锁定或禁用。
• Normally open contact
  常开接点
• One channel external alarm , it can be set to 5 modes : always open
  ：有一路外部告警，可设置成常开常开锁定常闭常闭锁定或禁用。
• Though time may change so many things ， the flower of friendship will always bloom and grow
  尽管岁月使万物变迁，可是友谊之花却常开不凋。
• I ' ve learned . . . . . that every one you meet deserves to greeted with a smile
  我学到. . . . . .遇见的人都应得到你一微笑的招呼。 [笑口常开?予人为善。
• Please accept my sincere wishes for the new year . i hope you will continue to enjoy good health
  新年到！祝你在新的一年里，开心、快乐、笑口常开。
• Like many of the characters she plays in her comedy , drew is easygoing and laughs a lot
  就像她在喜剧里表演的很多角色一样，德鲁平易近人，经常笑口常开。
• Inside of the limit switch there are screws , four sole switches , tow are normal open , tow are normal close
  限位开关内有连接螺钉，单开关有四个，两个常开，两个常闭。