What are the three elements of first aid?

One of the three elements of first aid. Establishing a sound and sensitive communication command organization is the basis for improving first aid and emergency response capabilities. China has begun to use 120 national unified emergency telephone, and adopts wireless telephone contact system, which has the functions of quickness, flexibility and no interference. It can quickly connect the patient's location, emergency centers (stations) and emergency departments (rooms) of various network hospitals. After rapid triage and dispatch by well-trained dispatchers, the green channel has been connected between on-site first aid, safe transport and emergency department (room) of receiving hospital. In the event of a catastrophic disaster, this system will show its superiority.