A.crossing
B.transit
C.transfer
D.passing
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A.directional current
B.forward current
C.propeller current
D.wake current
A.Shift weight to the bow
B.Shift weight to the center of the boat
C.Shift weight to the stern
D.Throw excess weight overboard
A.Port
B.Commercial area
C.Berth
D.Roadstead
A.is ready to use but vessels must stand clear
B.is ready to use and vessels may approach
C.cannot be made ready immediately and vessels shall stand clear
D.cannot be made ready immediately but vessels may approach
A.ready for entrance
B.ready for entrance，but gates cannot be closed completely
C.being made ready for entrance
D.not ready for entrance
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On a single-screw vessel the stern frame（）.
A tug’s horsepower available at the shaft is（）.
All persons or vessels within the lock area，including the lock approach channels，come under the authority of the（）.
When pushing ahead，wires leading from the quarters of the after outboard barges to the bow of a towboat（）.
In most cases，when a large merchant vessel enters shallow water at high speed the（）.
If a tow sinks in shallow water，you should（）.
On a twin-screw，twin-rudder vessel，the most effective way to turn in your own water，with no way on，is to put（）.
An alternating light（）.
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.
Any vessel shall，if the circumstances of the case admit，avoid（）in a narrow channel.