单项选择题

A.before you enter the waterB.after you enter the water……

The external flotation bladder on an immersion suit should be inflated（）.

A.before you enter the water
B.after you enter the water
C.after one hour in the water
D.after you notice that your suit is losing buoyancy

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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

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

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

单项选择题The daily recurring pattern of pressure changes most noticeable in low latitudes is the （）.

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