單項選擇題Keep clear（）the buoy.
A.to
B.on
C.of
D.for
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1.單項選擇題In the International Code of signals，a group of three letters indicates（）.
A.urgency or an emergency
B.the vessel's national identity signal
C.a group from the general signal code
D.a group from the medical signal code
2.單項選擇題In order to prevent galvanic corrosion，an aluminum boat must be insulated from the davits and gripes. Which of the following is acceptable as an insulator?（）
A.Hard rubber
B.Canvas
C.Leather
D.Sponge rubber
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Which statement is TRUE concerning radiotelephones on board towing vessels?（）
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Smoking in bed on a ship is prohibited（）.
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Which tool is used to open the strands of fiber lines when making an eye splice?（）
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Which term describes a part of a natural fiber line?（）
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