單項選擇題Before entering an ice area,the ship should be().

A.either trimmed by the head or the stern
B.on an even keel
C.trimmed down by the head
D.trimmed down by the stern


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2.單項選擇題An alternating light().

A.shows a light with varying lengths of the lighted period
B.shows a light that changes color
C.marks an alternate lesser-used channel
D.is used as a replacement for another light

4.單項選擇題A vessel which is being assisted by an icebreaker would display a flag hoist consisting of the code numeral 4 when the vessel().

A.speed begins to drop
B.stops
C.receives ice damage
D.becomes icebound

5.單項選擇題A vessel which is being assisted by an icebreaker should indicate that she is ready to cast off the towline by().

A.displaying code letter Y (Yankee)
B.sounding five short blasts on his whistle
C.displaying code numeral 5
D.sounding one prolonged blast on his whistle