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N a device that gives a visual indication as to which of a number of electric circuits has operated, such as an indicator in a hotel showing in which room a bell has been rung 指示器
The NFPA has specific requirements for remote annunciators used in some applications, such as hospitals.
美国国家防火协会对指示器在某些行业的应用有特殊要求，例如医院等。
Annunciators are typically used in applications where the equipment monitored is not located in a portion of the facility that is normally attended.
指示器通常使用在监测设备不在设备现场的应用。
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