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

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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
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All persons or vessels within the lock area，including the lock approach channels，come under the authority of the（）.

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

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