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
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1.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
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2.單項選擇題In battery charging rooms，ventilation should be provided（）.
A.at the lowest point
B.near the batteries
C.at the highest point
D.only when charging is in progress
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If passengers are on board when an abandon ship drill is carried out，they should（）.
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Proper use shall be made（）radar equipment if fitted and operational.
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