單項(xiàng)選擇題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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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

4.單項(xiàng)選擇題A vessel showing a rigid replica of the International Code flag A is engaged in().

A.diving operations
B.dredging
C.fishing
D.mineclearance operations

5.單項(xiàng)選擇題A vessel shall slacken her speed,stop,or reverse her engines,if necessary,to().

A.avoid collision
B.allow more time to assess the situation
C.be stopped in an appropriate distance
D.All of the above