Automatic mechanical ventilation shutdown is required for CO₂ systems protecting the（）.

An inflatable liferaft should be lifted back aboard the ship by using（）.

A.the single hook at the top of the raft
B.two lines passed under the raft
C.the towing bridle
D.All of the above

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After using a CO2 extinguisher on a ship，it should be（）.

A.put back in service if some CO₂ remains
B.hydrostatically tested
C.retagged
D.recharged

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