单项选择题
The term "load on top" is used on many crude oil carriers, is to provide a method for （）.
A.calculating the ullage in the cargo tanks
B.loading ballast by gravity
C.the loading of new cargo into the slop tank as a procedure to minimize pollution
D.calculating the ratio of cargo expansion in a cargo tank
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A.close the tank filling valves quickly
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Which of the precautions listed should be observed when taking on diesel fuel?（）
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