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
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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
A.the height of the tide
B.depth of water under the bridge
C.charted vertical clearance at mean low water
D.distance from the water to low steel of the bridge
A.concealed
B.buried
C.existed
D.built
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The distance between the surface of the water and the tidal datum is the （）.
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 （）.
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.
Conditions for crossing a rough bar are usually best at （）.
The height of a light is measured from which reference plane?（）
During daylight savings time the meridian used for determining the time is located farther （）.
Above-normal tides near the center of a hurricane maybe caused by the （）.
Areas enclosed by a long and short dashed magenta line indicate （）.
On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will （）.
The height of eye correction is smaller than geometrical dip because of （）.