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
最新試題
The Earth’s irregular heating is caused by （）.
As these features are not all charted，special caution should be exercised （） vessels navigating in the vicinity.
Areas enclosed by a long and short dashed magenta line indicate （）.
An occulting light is one in which （）.
A tug is to assist in docking an oceangoing vessel on a hawser. The greatest danger to the tug is （）.
Above-normal tides near the center of a hurricane maybe caused by the （）.
Lateral movement of the vessel to leeward of its course defines （）.
A vessel is entering port A for the first time and has a Pilot conning the vessel. The Master is unsure that the Pilot is taking sufficient action to prevent a collision. What should the Master do（）.
The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.
Conditions for crossing a rough bar are usually best at （）.