单选题Why is it important for fuel oil tanks not to be topped off at the inner bottom level when loading on a cold day?（）AIncreased viscosity of the product needs higher loading pressure, which increases the chances of a spillBAir pockets may cause the fuel to bubble out of the ullage holeCThe temperature rise of the fuel will cause an overflowDFueling valve may become stuck closed and cause the fuel oil to spill before the valve can be opened
单选题
Why is it important for fuel oil tanks not to be topped off at the inner bottom level when loading on a cold day?（）
A
Increased viscosity of the product needs higher loading pressure, which increases the chances of a spill
B
Air pockets may cause the fuel to bubble out of the ullage hole
C
The temperature rise of the fuel will cause an overflow
D
Fueling valve may become stuck closed and cause the fuel oil to spill before the valve can be opened
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