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
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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 -
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
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