When the ship is going to enter into the harbor,（）<br>A:change from heavy fuel oil to diesel oil for mail engine<br>B:pumping oil bilge water<br>C:change sea chest form high level one to lower one<br>D:test emergency generator

When the ship is going to enter into the harbor,（）
A:change from heavy fuel oil to diesel oil for mail engine
B:pumping oil bilge water
C:change sea chest form high level one to lower one
D:test emergency generator

出自：海船船员证

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