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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The distance between the surface of the water and the tidal datum is the （）.
A tug is to assist in docking an oceangoing vessel on a hawser. The greatest danger to the tug is （）.
The height of tide is the （）.
Attention is called to the fact that in many cases pipelines are not （） and charted depths may be decreased by up to 2 meters．
During a period of whiteout，you should expect which of the following（）.
An occulting light is one in which （）.
The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.
A vessel is entering port A for the first time and has a Pilot conning the vessel. The Master is unsure that the Pilot is taking sufficient action to prevent a collision. What should the Master do（）.
On a voyage from Capetown to London，the favorable ocean current off the coast of Africa is the （）.
The Earth has the shape of a(n) （）.