单项选择题

（）indicates the weight of the vessel and is,therefore,according to a well known principle of physics,equal to the weight of the water it displaces.

A.Gross tonnage
B.Net tonnage
C.Displacement tonnage
D.Deadweight tonnage

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单项选择题

The mariner must be the final judge of the reliance he can place on the information given in the Admiralty charts and other publications,since they（）.

A.may always be complete and up-to-date
B.may not always be complete and up-to-date
C.may sometimes be complete and up-to-date
D.may not sometimes be complete and up-to-date

单项选择题

A light is（）from Changshanzui,the SE extremity of the island.

A.exhibited
B.established
C.constructed
D.built