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

The diurnal variation of pressure is most noticeable（）.

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

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The diurnal pressure variation is most noticeable in the（）.

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

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