A.only one high and one low water occur during a lunar day
B.the high tide is higher and the low tide is lower than usual
C.the high tide and low tide are exactly six hours apart
D.two high tides occur during a lunar day
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A.bar securing a cargo port
B.centerline vertical bulkhead
C.deep beam
D.spanner stay
A.crossing
B.transit
C.transfer
D.passing
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
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A vessel proceeding along a narrow channel shall（）.
A vessel which is being assisted by an icebreaker would display a flag hoist consisting of the code numeral 4 when the vessel（）.
A tug’s horsepower available at the shaft is（）.
On a twin-screw，twin-rudder vessel，the most effective way to turn in your own water，with no way on，is to put（）.
A vessel showing a rigid replica of the International Code flag A is engaged in（）.
A vessel reduces speed without backing. The rate that her speed through the water decreases depends primarily on the（）.
An alternating light（）.
A vessel proceeding along the course of a narrow channel shall keep as near to the outer limitof the channel which lies on her starboard side as it is safe and practicable.Which one of the followings does the statement express?（）.
A vessel which is being assisted by an icebreaker should indicate that she is ready to cast off the towline by（）.
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.