單項(xiàng)選擇題

Antiseptics are used principally to（）.

A.speed healing
B.prevent infection
C.reduce inflammation
D.increase blood circulation

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An unconscious person should NOT be（）.

A.placed in a position with the head lower than the body
B.given an inhalation stimulant
C.given something to drink
D.treated for injuries until conscious

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