单项选择题
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
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相关考题
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单项选择题
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 -
单项选择题
I have no choice（）to put such remarks.
A.or
B.and
C.but
D.when -
单项选择题
I herely request permission to（）the ship hull for routine maintenance.
A.put paint on
B.apply paint onto
C.oil
D.paint
