A.temperature and salinity differences in the water
B.wind and density differences in the water
C.water depth and underwater topography
D.rotation of the Earth and continental interference
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A.black
B.setting
C.being
D.having
A.falls／in
B.has been falling／on
C.has fallen／at
D.is falling／in
A.is flowing towards the land
B.is moving towards the ocean
C.level is not changing
D.level is rising because of heavy rains
A.Prevailing Westerly
B.Sub-Polar Flow
C.West Wind Drift
D.Humboldt Current
A.the density of the water
B.the air temperature
C.the presence of a high pressure area near it
D.underwater soil conditions
最新試題
Priming of the tides occurs（）.
Neap tides occur when the（）.
The two most effective generating forces of surface ocean currents are（）.
（）is not a type of tide.
River currents tend to（）.
Stand of the tide is that time when（）.
The tide is（）.
The velocity of a rotary tidal current will be decreased when the Moon is（）.
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?（）
When there are small differences between the heights of two successive high tides or two successive low tides，the tides are called（）.