When the ships is going to enter into the harbor, _____.A.change from diesel oil to heavy

When the ships is going to enter into the harbor, _____.

A.change from diesel oil to heavy fuel oil for mail engine

B.pump out bilge water

C.change sea chest form. lower level one to high level one

D.test emergency generator

请帮忙给出正确答案和分析，谢谢！

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