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 any two meridians measured along a parallel of latitude （）.
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.
On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will （）.
In Admiralty Sailing Directions，bands is the word used to indicate（）marking．
Attention is called to the fact that in many cases charted depths may be decreased by up to （）.
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（）.
The Earth’s irregular heating is caused by （）.
As these features are not all charted，special caution should be exercised （） vessels navigating in the vicinity.
Information on the operating times and characteristics of foreign radiobeacons can be found in which publication? （）