（）directly affect the fitness and ability of a seafarer to perform watchkeeping duties.<br>A:Smoking<br>B:Drug and alcohol abuse<br>C:Fruit<br>D:Vegetables

（）directly affect the fitness and ability of a seafarer to perform watchkeeping duties.
A:Smoking
B:Drug and alcohol abuse
C:Fruit
D:Vegetables

出自：海船船员证

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