A.watch
B.look for
C.see
D.regard
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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
A.lower low water
B.high water
C.low water
D.sea level
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The period at high or low tide during which there is no change in the height of the water is called the （）.
Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.
Clearance gauges at bridges indicate （）.
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
The Earth’s irregular heating is caused by （）.
During a period of whiteout，you should expect which of the following（）.
Attention is called to the fact that in many cases pipelines are not （） and charted depths may be decreased by up to 2 meters．
Information on the operating times and characteristics of foreign radiobeacons can be found in which publication? （）
On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will （）.
Above-normal tides near the center of a hurricane maybe caused by the （）.