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單項(xiàng)選擇題

How should cargo tank hatches be protected when the ullage opening is open and the tank not gas free?（）.

A.With gooseneck vents
B.With warning signs
C.With flame screens
D.With pressure-vacuum relife valves

單項(xiàng)選擇題

Hygroscopic cargoes should be ventilated when（）.

A.going from a warm to a cold
B.the dew point of the outside air is greater than the dew point of the air in the hold
C.the dew point of the air in the hold is very low
D.the outside dew point is 16°C and the cargo temperature is 12°C