A.ahead of the storm center
B.in the dangerous semicircle
C.in the navigable semicircle
D.directly in the approach path of the storm
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A.Alaska Current
B.Subarctic Current
C.Kuroshio Current
D.Oyashio Current
A.air being warmed above the dew point
B.saturation of cold air by rain
C.a rapid cooling of the air near the surface of the Earth at night
D.warm moist air being blown over a colder surface
A.Northwest
B.Southeast
C.Northeast
D.Southwest
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
A.hydraulic current
B.rectilinear current
C.rotary current
D.harmonic current
最新試題
In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n)（）.
The drift and set of tidal，river，and ocean currents refer to the（）.
The apparent wind can be zero when the true wind is from（）.
The cold ocean current which meets the warm Gulf Stream between latitudes 40°and 43°N to form the cold wall is called the（）.
In the Northern Hemisphere you are caught in the dangerous semicircle with plenty of sea room available. The best course of action is to bring the wind on the（）.
The edge of a hurricane has overtaken your vessel in the Gulf of Mexico，and the northwest wind of a few hours ago has shifted to the west. This is an indication that you are located in the（）.
In the Northern Hemisphere the major ocean currents tend to flow（）.
Advection fog is most commonly caused by（）.
In some river mouths and estuaries the incoming high-tide wave crest overtakes the preceding low-tide trough. This results in a wall of water proceeding upstream，and is called a（）.
Steam fog is most likely to occur on the Mississippi and Ohio Rivers in（）.