单项选择题
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
All persons or vessels within the lock area，including t...
单项选择题All persons or vessels within the lock area，including the lock approach channels，come under the authority of the（）.
A.dockmaster B.dock captain C.lockmaster D.lock foreman
