单项选择题

Antiseptics are used principally to（）.

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

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单项选择题

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

单项选择题

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

单项选择题

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