单项选择题

Hygroscopic cargoes should be ventilated when（）.

A.going from a warm to a cold climate
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

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

A.With gooseneck vents
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D.Inert gas dilutes the flammable vapor and air concentrations to keep them below the lower explosive limit

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How about deducting 10 bundles，（）is to say 50 bundles partly rusty?

A.it
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