单选

_____ system is arranged to ensure that water can be drawn from any tank or the sea and discharged to any other tank or the sea as required to trim the vessel.

A.The domestic water
B.Bilge water
C.Oil transfer
D.The ballast

试题出自试卷《海船船员考试轮机部三管轮模拟题1(轮机英语)》

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