A.lower low water
B.high water
C.low water
D.sea level
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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
A.by
B.with
C.on
D.in
最新試題
Clearance gauges at bridges indicate （）.
On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will （）.
For full information regarding the current circulation of the Indian Ocean,（） Sailing Direction,Current Atlas,etc.
A pilot vessel on pilotage duty shall show identity lights （）.
The Earth’s irregular heating is caused by （）.
On a voyage from Capetown to London，the favorable ocean current off the coast of Africa is the （）.
As these features are not all charted，special caution should be exercised （） vessels navigating in the vicinity.
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.
In Admiralty Sailing Directions，bands is the word used to indicate（）marking．
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 （）.