题目内容

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 seawater bleeding into the inflation bladder and reacting with a chemical

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