單項(xiàng)選擇題

Sailors should keep （）at sea.

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

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單項(xiàng)選擇題

（）refers to the height from the waterline to the bottom of the ship.

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

單項(xiàng)選擇題

（）refers to the repair the ship every year.

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