单项选择题

For operations in pack ice，a vessel should（）.

A.be on an even keel
B.be trimmed slightly by the head
C.have a drag of not more than 60 - 90 centimeters
D.be ballasted so the forefoot is near the surface

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单项选择题

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

单项选择题

Any vessel shall，if the circumstances of the case admit，avoid（）in a narrow channel.

A.anchor
B.to anchor
C.anchoring
D.to anchoring

单项选择题

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