A.horizontal
B.vertical
C.diagonal
D.vertical or diagonal
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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
A.low water slack
B.high water slack
C.high water ebb
D.high water flood
最新試題
During a period of whiteout，you should expect which of the following（）.
The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.
In Admiralty Sailing Directions，bands is the word used to indicate（）marking．
Clearance gauges at bridges indicate （）.
Attention is called to the fact that in many cases charted depths may be decreased by up to （）.
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．
On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will （）.
The meaning of ebb tide is that （）.
Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.