A.more serious
B.not less serious
C.more dangerous
D.no more dangerous
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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
A.one nautical mile
B.two kilometers
C.5 cables only
D.one fathom
最新試題
On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will （）.
Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.
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（）.
The distance between the surface of the water and the tidal datum is the （）.
A pilot vessel on pilotage duty at night will show sidelights and a sternlight （）.
AFTER DROPPING THE PILOT means （）.
A tug is to assist in docking an oceangoing vessel on a hawser. The greatest danger to the tug is （）.
The period at high or low tide during which there is no change in the height of the water is called the （）.
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.