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) （）.
Conditions for crossing a rough bar are usually best at （）.
The distance between any two meridians measured along a parallel of latitude （）.
The Earth’s irregular heating is caused by （）.
The meaning of ebb tide is that （）.
A pilot vessel on pilotage duty shall show identity lights （）.
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
A tug is to assist in docking an oceangoing vessel on a hawser. The greatest danger to the tug is （）.
Areas enclosed by a long and short dashed magenta line indicate （）.
An occulting light is one in which （）.