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

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

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

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B.accumulation of explosive and toxic gases the battery can generate
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D.battery failure including battery case meltdown caused by excessive heat