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
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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
A.concealed
B.buried
C.existed
D.built
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The Earth has the shape of a(n) （）.
For full information regarding the current circulation of the Indian Ocean,（） Sailing Direction,Current Atlas,etc.
Lateral movement of the vessel to leeward of its course defines （）.
The Earth’s irregular heating is caused by （）.
The distance between any two meridians measured along a parallel of latitude and expressed in miles is the （）.
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
At last，the palm trees that fringe the natural harbor of Port Aloahoa come into view on the horizon lit by the setting sun.The meaning of this sentence is that （）.
The distance between any two meridians measured along a parallel of latitude （）.
Information on the operating times and characteristics of foreign radiobeacons can be found in which publication? （）
AFTER DROPPING THE PILOT means （）.