单项选择题

In order to release CO₂ to the machinery spaces from a fixed fire extinguishing system, you must（）.

A.actuate an alarm and open the engine room control valve
B.actuate an alarm and open the engine room CO₂releasing valve
C.open the engine room control valve and shut off engine room ventilation fans
D.open the engine room control valve and then the CO₂releasing valve

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To prevent the overflow of cargo tanks due to expansion, you should top off （）.

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B.to within 1% to 3% of its capacity
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Your ship has run aground and it is necessary to determine whether or not a compartment has floodedTherefore, you should （）.

A.open the watertight door and take a quick look
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D.feel the bulkhead to see if it is hot

In order to release CO2 to the machinery spaces from a fixed fire extinguishing system, you must（）.

相关考题

In order to release CO₂ to the machinery spaces from a fixed fire extinguishing system, you must（）.