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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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 -
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
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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
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