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 distance between any two meridians measured along a parallel of latitude （）.
On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will （）.
As these features are not all charted，special caution should be exercised （） vessels navigating in the vicinity.
Clearance gauges at bridges indicate （）.
Areas enclosed by a long and short dashed magenta line indicate （）.
During daylight savings time the meridian used for determining the time is located farther （）.
Attention is called to the fact that in many cases charted depths may be decreased by up to （）.
A pilot vessel on pilotage duty shall show identity lights （）.
Information on the operating times and characteristics of foreign radiobeacons can be found in which publication? （）
For full information regarding the current circulation of the Indian Ocean,（） Sailing Direction,Current Atlas,etc.