单项选择题

A portable dry chemical fire extinguisher discharges by……

A portable dry chemical fire extinguisher discharges by（）.

A.gravity when the extinguisher is turned upside down
B.pressure from a small CO₂ cartridge on the extinguisher
C.air pressure from the hand pump attached to the extinguisher
D.pressure from the reaction when water is mixed with the chemical

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单项选择题A passenger vessel is required to have a supervised patrol when（）.

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A.Fire party
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A.water
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