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 from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.
The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.
As these features are not all charted，special caution should be exercised （） vessels navigating in the vicinity.
The meaning of ebb tide is that （）.
In Admiralty Sailing Directions，bands is the word used to indicate（）marking．
The height of a light is measured from which reference plane?（）
For full information regarding the current circulation of the Indian Ocean,（） Sailing Direction,Current Atlas,etc.
A vessel not to impede the passage of another vessel is not relieved （） taking collision-avoiding action.
The Earth has the shape of a(n) （）.
Attention is called to the fact that in many cases charted depths may be decreased by up to （）.