默认题库 - 海洋学基本知识

单选题

A current perpendicular to a vessel’s track has the greatest effect on the vessel’s course made good（）.

A. at high vessel speeds
B. at low vessel speeds
C. in shallow water
D. in deep water

单选题

A backlash below a lock is defined as（）.

A. a current setting your vessel on the wall
B. a current setting into the lock chamber
C. an eddy working along the lower guide wall
D. a current setting counterclockwise

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单选题

A rotary current sets through all directions of the compass. The time it takes to complete one of these cycles is approximately（）.

A. 3 hours
B. 6 1/2 hours
C. 12 1/2 hours
D. 25 hour

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单选题

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（）.

A. navigable semicircle
B. dangerous semicircle
C. low pressure area
D. eye of the storm

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单选题

The direction of the surface wind is（）.

A. directly from high pressure toward low pressure
B. directly from low pressure toward high pressure
C. from high pressure toward low pressure deflected by the earth's rotation
D. from low pressure toward high pressure deflected by the earth's rotatio

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单选题