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
On a voyage from Capetown to London，the favorable ocean current off the coast of Africa is the （）.
The meaning of ebb tide is that （）.
Above-normal tides near the center of a hurricane maybe caused by the （）.
In Admiralty Sailing Directions，bands is the word used to indicate（）marking．
Attention is called to the fact that in many cases pipelines are not （） and charted depths may be decreased by up to 2 meters．
Clearance gauges at bridges indicate （）.
A pilot vessel on pilotage duty shall show identity lights （）.
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 （）.
A tug is to assist in docking an oceangoing vessel on a hawser. The greatest danger to the tug is （）.
The height of tide is the （）.