單項選擇題

The self-contained breathing device should not be used in which situation（）.

A.Oxygen deficient spaces
B.Compartments containing poisonous vapors
C.Fighting fires that produce heavy smoke
D.Underwater search

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單項選擇題

The rescuer can best provide an airtight seal during mouth-to-mouth resuscitation by pinching the victim’s nostrils and（）.

A.Cupping a hand around the patient's mouth
B.Keeping the head elevated
C.Applying his mouth tightly over the victim's mouth
D.Holding the jaw down firmly

單項選擇題

The key to rescuing a man overboard is（）.

A.Good communication
B.A dedicated crew
C.Good equipment
D.Well-conducted drills