单项选择题
The Experimental Lighthouse-buoy has no navigational significance and may be removed at will.The above sentence means（）.
A.It's of no use for navigation and would be removed with notice
B.It's useful in navigation and may be removed without notice
C.It's helpless in navigation and may be removed without notice
D.It's helpful in navigation and may be removed without notice
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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 -
单项选择题
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 -
单项选择题
The diurnal pressure variation is most noticeable in the（）.
A.polar regions
B.horse latitudes
C.roaring forties
D.doldrums
