A.List of Lights
B.Coast Pilot
C.Sailing Directions
D.List of Radiobeacons
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A.horizontal
B.vertical
C.diagonal
D.vertical or diagonal
A.watch
B.look for
C.see
D.regard
A.west in west longitude and east in east longitude
B.east in west longitude and west in east longitude
C.west
D.east
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
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The height of tide is the （）.
The Earth has the shape of a(n) （）.
Conditions for crossing a rough bar are usually best at （）.
In Admiralty Sailing Directions，bands is the word used to indicate（）marking．
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.
The height of eye correction is smaller than geometrical dip because of （）.
For full information regarding the current circulation of the Indian Ocean,（） Sailing Direction,Current Atlas,etc.
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
A vessel not to impede the passage of another vessel is not relieved （） taking collision-avoiding action.
Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.