单选题Petroleum cargo tanks should not be topped off at deck level when loading on a cold day because（）.Aa subsequent temperature rise will cause the cargo to overflowBair pockets may cause the cargo to bubble out of the ullage holeCthe increased viscosity of the product requires higher loading pressure which increases the chances of a spillDthe tank valve may be stiff and a spill will occur before the valve can be closed
单选题
Petroleum cargo tanks should not be topped off at deck level when loading on a cold day because（）.
A
a subsequent temperature rise will cause the cargo to overflow
B
air pockets may cause the cargo to bubble out of the ullage hole
C
the increased viscosity of the product requires higher loading pressure which increases the chances of a spill
D
the tank valve may be stiff and a spill will occur before the valve can be closed
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