______directly affect the fitness and ability of a seafarer to perform watchkeeping duties.
A.Smoking
B.Drugandalcoholabuse
C.Fruit
D.Vegetables
正确答案是B
______directly affect the fitness and ability of a seafarer to perform watchkeeping duties.
A.Smoking
B.Drugandalcoholabuse
C.Fruit
D.Vegetables
正确答案是B