单项选择题

The effect of wind on exposed areas of the vessel is most noticeable when（）.

A.backing
B.going slow ahead
C.going full ahead
D.turning

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单项选择题

A.above the polar circles
B.in a low pressure area
C.during periods of low temperatures
D.in the doldrums

单项选择题

A.polar regions
B.horse latitudes
C.roaring forties
D.doldrums

单项选择题

A.daily lapse reading
B.diurnal variation of pressure
C.pressure tendency
D.synoptic pressure