A.horizontal
B.vertical
C.diagonal
D.vertical or diagonal
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A.watch
B.look for
C.see
D.regard
A.west in west longitude and east in east longitude
B.east in west longitude and west in east longitude
C.west
D.east
A.Snowfall or blowing snow
B.Lack of ability to estimate distance
C.Harsh contrast between sun-illuminated snow cover and the background
D.Hazy horizons with extensive mirage effects
A.more serious
B.not less serious
C.more dangerous
D.no more dangerous
A.low water slack
B.high water slack
C.high water ebb
D.high water flood
最新試題
Attention is called to the fact that in many cases pipelines are not （） and charted depths may be decreased by up to 2 meters．
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.
During daylight savings time the meridian used for determining the time is located farther （）.
The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.
A pilot vessel on pilotage duty shall show identity lights （）.
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 height of a light is measured from which reference plane?（）
Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.
Information on the operating times and characteristics of foreign radiobeacons can be found in which publication? （）
On a voyage from Capetown to London，the favorable ocean current off the coast of Africa is the （）.