A.west in west longitude and east in east longitude
B.east in west longitude and west in east longitude
C.west
D.east
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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
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
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Conditions for crossing a rough bar are usually best at （）.
Attention is called to the fact that in many cases charted depths may be decreased by up to （）.
During daylight savings time the meridian used for determining the time is located farther （）.
Clearance gauges at bridges indicate （）.
The height of a light is measured from which reference plane?（）
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.
An occulting light is one in which （）.
The height of tide is the （）.
The distance between any two meridians measured along a parallel of latitude （）.
On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will （）.