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單項(xiàng)選擇題

An advantage of an ABC dry chemical over a carbon dioxide extinguisher is（）.

A.lack of toxicity
B.the multipurpose extinguishing ability
C.burn-back protection
D.cooling ability

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單項(xiàng)選擇題

All inspected vessels on unrestricted ocean routes must have equipment on board for testing an individual’s（）.

A.blood
B.breath
C.urine
D.All of the above

單項(xiàng)選擇題

After an accident the victim may go into shock and die. What should be done to help prevent shock?（）

A.Slightly elevate the head and feet
B.Keep the person awake
C.Keep the person lying down and at a comfortable temperature
D.Give the person a stimulant to increase blood flow

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