A.by
B.with
C.on
D.in
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A.Northwesterly
B.Southwesterly
C.Southerly
D.Northerly
A.when the wind is against you
B.with the current setting against you
C.at slack water
D.with a cross current
A.SW'ly direction along the NW coast of Africa
B.S'ly direction off the East Coast of Australia
C.NW'ly direction along the SW coast of Africa
D.SW'ly direction along the SE coast of Greenland
A.fetch
B.distant winds
C.local storms
D.the pull of the moon
A.the vertical rise or fall of the tide has stopped
B.slack water occurs
C.tidal current is at a maximum
D.the actual depth of the water equals the charted depth
最新試題
The velocity of a rotary tidal current will be decreased when the Moon is（）.
The speed of an ocean current is dependent on（）.
When daylight savings time is kept，the time of tide and current calculations must be adjusted.One way of doing this is to（）.
Tropic tides are caused by the（）.
The tide is（）.
Which current would you encounter on a direct passage from southern Africa to Argentina，South America（）.
Water may boil up around the stern of a vessel in a channel due to（）.
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?（）
Tides are superimposed on nontidal rising and falling water levels，caused by（）．
Neap tides occur only（）.