单项选择题

How is the external flotation bladder of an immersion suit inflated?（）

A.It is inflated by a small CO₂ bottle that is automatically tripped when the front zipper is at the top of the zipper track
B.It is inflated by a small CO₂ bottle that is manually tripped
C.It is inflated by blowing through an inflation tube
D.It inflates by sea water bleeding into the flotation bladder and reacting with a chemical therein

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How does foam extinguish an oil fire?（）.

A.By cooling the oil below the ignition temperature
B.By removing the fuel source from the fire
C.By excluding the oxygen from the fire
D.By increasing the weight of the oil

单项选择题

How do you operate a portable CO₂ fire extinguisher?（）.

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单项选择题

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