单项选择题

Considering the general circulation of the atmosphere，the wind system between latitudes 30°N and 60°N is commonly called the（）.

A.prevailing westerlies
B.horse latitudes
C.trade winds
D.subpolar low pressure belts

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A.Weather side
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C.Upwind side
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单项选择题Concerning the identification signal for a pilot vessel，in fog，which statement is TRUE?（）

A.When at anchor，the pilot vessel is only required to sound anchor signals
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单项选择题Concerning a celestial observation，the azimuth angle is measured from the principal vertical circle to the（）.

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D.vertical circle of the body

船舶舱室名称

Considering the general circulation of the atmosphere，the wind system between latitudes 30°N and 60°N is commonly called the（）.