A.watch
B.look for
C.see
D.regard
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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
A.lower low water
B.high water
C.low water
D.sea level
最新試題
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
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 height of a light is measured from which reference plane?（）
The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.
The distance between the surface of the water and the tidal datum is the （）.
Lateral movement of the vessel to leeward of its course defines （）.
Above-normal tides near the center of a hurricane maybe caused by the （）.
The Earth’s irregular heating is caused by （）.