A.low water slack
B.high water slack
C.high water ebb
D.high water flood
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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
A.one nautical mile
B.two kilometers
C.5 cables only
D.one fathom
A.a vessel arrives at a port in a evening
B.a vessel leaves a port in a evening
C.a vessel arrives at a port in a morning
D.a vessel leaves a port in a morning
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For full information regarding the current circulation of the Indian Ocean,（） Sailing Direction,Current Atlas,etc.
Conditions for crossing a rough bar are usually best at （）.
The height of a light is measured from which reference plane?（）
Above-normal tides near the center of a hurricane maybe caused by the （）.
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? （）
In Admiralty Sailing Directions，bands is the word used to indicate（）marking．
Due to lapse of time the risk in these areas to surface navigation is now considered （）than the ordinary risks of navigation，but a very real risk still exists with regard to anchoring，fishing or any form of submarine or seabed activity.
An occulting light is one in which （）.
Areas enclosed by a long and short dashed magenta line indicate （）.