Q. state 3 factors of which site personnel should be aware relating to 1st aid on

Dont really know how to answer this ...

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Answers:    Your examine isn't very clear but, if you are asking what I expect you are asking, the 3 vital things to access surrounded by a first aid situation are known as the ABCs:
airway
breathing
circulation

Airway - you own to know that nothing is blocking the person's proboscis or mouth, that there are no obstruction.

Breathing - you want to know that the patient is breathing. You should see (chest rising and falling), hear or grain (get close to nose and mouth) the personage breathing.

Circulation - how is the person's color, temperature of their skin and do you payment a pulse?

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