According to MLC,the minimum hours of rest shall not be less than 10 hours in any 24-hour period,and（）hours in any seven-day period.

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

单项选择题Malacca Strait is 805 km（）and（）from 64 km in the S to 257 km in the N.

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

单项选择题It is customary in shipping practice to quote freight rates（）weight or measurement,ship’s option.

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

单项选择题When underway in a channel,you should keep to the（）.

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

单项选择题（）is not ordinarily applied to passenger or to combination passenger and freight ships.

A.displacement tonnage
B.deadweight tonnage
C.registered tonnage
D.gross tonnage