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
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
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 meaning of ebb tide is that （）.
The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.
During a period of whiteout，you should expect which of the following（）.
Clearance gauges at bridges indicate （）.
Attention is called to the fact that in many cases charted depths may be decreased by up to （）.
The period at high or low tide during which there is no change in the height of the water is called the （）.
Areas enclosed by a long and short dashed magenta line indicate （）.
Above-normal tides near the center of a hurricane maybe caused by the （）.