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 is proceeding downstream in a narrow channel on the Western Rivers when another vessel is sighted moving upstream. Which vessel has the right of way? （）
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 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?（）.
Any vessel shall，if the circumstances of the case admit，avoid（）in a narrow channel.
For operations in pack ice，a vessel should（）.
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.
Topside icing decreases vessel stability because it is usually off-center and（）.
When pushing ahead，wires leading from the quarters of the after outboard barges to the bow of a towboat（）.
Ice blink is（）.
A vessel proceeding along a narrow channel shall（）.