单项选择题
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
Before entering an ice area，the ship should be（）.A.eith...
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
Any vessel shall，if the circumstances of the case admit...
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
An alternating light（）.A.shows a light with varying len...
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
