单项选择题
Which of the following operations aboard a tanker must be recorded in the Oil Record Book （）
A.Any internal transfer of oil cargo during a voyage
B.The discharge overboard in port or at sea of any bilge water accumulated in machinery spaces
C.The loading or unloading of any or all oil cargo
D.All of the above
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A.flash point
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Which of the following statements describes one of the functions of the ballast system?（）
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