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
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单项选择题
A vessel which is being assisted by an icebreaker would display a flag hoist consisting of the code numeral 4 when the vessel（）.
A.speed begins to drop
B.stops
C.receives ice damage
D.becomes icebound -
单项选择题
A vessel which is being assisted by an icebreaker should indicate that she is ready to cast off the towline by（）.
A.displaying code letter Y (Yankee)
B.sounding five short blasts on his whistle
C.displaying code numeral 5
D.sounding one prolonged blast on his whistle -
单项选择题
A vessel the passage of which is not to be impeded（）to comply with this Rule when the two vessels are approaching one another so as to involve risk of collision.
A.remains fully obliged
B.has no obligation
C.is not necessarily
D.is exempted
