The main body of a vessel is the （）.

单项选择题Sailors should keep （）at sea.

A.lookout
B.outlook
C.uplook
D.lookup

单项选择题（）refers to the height from the waterline to the bottom of the ship.

A.Draft
B.Freeboard
C.Derrick
D.Drift

单项选择题（）refers to the repair the ship every year.

A. Voyage repair
B. Annual repair
C. Periodical repair
D. Survey check

单项选择题（）is used to absorb the water.

A.Paper
B.Glass
C.Sponge
D.Stow

单项选择题（）refers to the repair during the voyage.

A. Voyage repair
B. Annual repair
C. Periodical repair
D. Survey check