默认题库 - 海洋学基本知识

单选题

The direction of the southeast trade winds is a result of the（）.

A. equatorial current
B. humidity
C. rotation of the earth
D. change of seaso

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单选题

The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.

A. must be from dead ahead
B. speed must be zero
C. must be from dead astern
D. must be on the beam

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单选题

The apparent wind can be zero when the true wind is from（）.

A. ahead and equal to the ship's speed
B. astern and equal to the ship's speed
C. ahead and equal to twice the ship's speed
D. astern and equal to twice the ship's speed

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单选题

Ocean currents are well defined and（）.

A. create large waves in the direction of the current
B. change direction 360°during a 24 hour period
C. remain fairly constant in direction and velocity throughout the year
D. are characterized by a light green color

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单选题

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（）.

A. starboard bow and make as much headway as possible
B. starboard quarter，and make as much headway as possible
C. port quarter，and make as much headway as possible
D. port bow，and make as much headway as possible

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单选题

In a tropical cyclone，in the Northern Hemisphere，a vessel hove to with the wind shifting counterclockwise is（）.

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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单选题

Cold water flowing southward through the western part of the Bering Strait between Alaska and Siberia is joined by water circulating counterclockwise in the Bering Sea to form the（）.

Alaska Current
B. Subarctic Current
C. Kuroshio Current
D. Oyashio Current

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单选题

A section of the river that is narrower than usual and is often navigable from bank to bank is a（）.

A. chute
B. stabilized channel
C. slough
D. navigable pa

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单选题

A light，feathery deposit of ice caused by the sublimation of water vapor directly into the crystalline form，on objects whose temperatures are below freezing，is called（）.

A. dew
B. frost
C. glaze
D. snow

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单选题

A current will develop between areas of different density in ocean waters. If you face in the same direction the current is flowing，the water of（）.

A. high density will be on the left in the Northern Hemisphere
B. high density will be on the right in the Southern Hemisphere
C. low density will be on the left in the Northern Hemisphere
D. low density will be on the left in the Southern Hemisphere

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