单项选择题

（）directly affect the fitness and ability of a seafarer to perform watchkeeping duties.

A.Smoking
B.Drug and alcohol abuse
C.Fruit
D.Vegetables

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单项选择题

A.long, widens
B.long, wide
C.length, widens
D.length, wide

单项选择题

A.on the basis of
B.as a result of
C.arise from
D.come into being

单项选择题

A.middle of the channel
B.starboard side of the channel
C.port side of the channel
D.side of the channel that has the widest turns