A.harmonic constant
B.establishment of the port
C.half-tide level
D.tide cycle
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A.North
B.South
C.East
D.West
A.stem the current and make very slow headway when the anchor is dropped
B.stem the current and be falling aft very slowly when the anchor is dropped
C.stem the current and endeavor to make neither headway nor sternway when the anchor is dropped
D.stop all headway through the water and keep the current astern when the anchor is dropped
A.period
B.range
C.distance
D.depth
A.by
B.with
C.on
D.in
A.Northwesterly
B.Southwesterly
C.Southerly
D.Northerly
最新試題
The tide（）.It’s 2 hours before low water，and（）your present position you will be aground at low water.
The velocity of a rotary tidal current will be decreased when the Moon is（）.
The Benguela Current flows in a（）.
Tides are superimposed on nontidal rising and falling water levels，caused by（）．
The term flood current refers to that time when the water（）.
Stand of the tide is that time when（）.
The set of the current is the（）.
（）is not a type of tide.
A wave entering（）is likely to produce bores．
To make sure of getting the full advantage of a favorable current，you should reach an entrance or strait at what time in relation to the predicted time of the favorable current?（）