A.the time of day
B.the seasons
C.geography
D.All of the above
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A.sphere
B.oblate spheroid
C.spheroid of revolution
D.oblate eggoid
A.air gap
B.freeboard
C.penetration
D.water depth
A.range of tide
B.height of tide
C.charted depth
D.actual water depth
A.difference in longitude
B.mid-longitude
C.departure
D.meridian angle
A.increases in north latitude and decreases in south latitude
B.decreases as DLO increases
C.increases with increased latitude
D.decreases with increased latitude
最新試題
On a voyage from Capetown to London，the favorable ocean current off the coast of Africa is the （）.
The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.
The meaning of ebb tide is that （）.
Conditions for crossing a rough bar are usually best at （）.
The height of a light is measured from which reference plane?（）
A tug is to assist in docking an oceangoing vessel on a hawser. The greatest danger to the tug is （）.
Due to lapse of time the risk in these areas to surface navigation is now considered （）than the ordinary risks of navigation，but a very real risk still exists with regard to anchoring，fishing or any form of submarine or seabed activity.
At last，the palm trees that fringe the natural harbor of Port Aloahoa come into view on the horizon lit by the setting sun.The meaning of this sentence is that （）.
The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.
The Earth has the shape of a(n) （）.