A.specified by international authorities
B.specified by national authorities
C.on standard map
D.on the chart or Sailing Directions in use
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A.assumed
B.appreciated
C.promised
D.permitted
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A vessel not to impede the passage of another vessel is not relieved （） taking collision-avoiding action.
Clearances of bridges and overhead cables below Bonneville Dam refer to heights in feet above mean （）.
The height of a light is measured from which reference plane?（）
Above-normal tides near the center of a hurricane maybe caused by the （）.
Clearance gauges at bridges indicate （）.
On a voyage from Capetown to London，the favorable ocean current off the coast of Africa is the （）.
Information on the operating times and characteristics of foreign radiobeacons can be found in which publication? （）
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.
The Earth has the shape of a(n) （）.
Attention is called to the fact that in many cases pipelines are not （） and charted depths may be decreased by up to 2 meters．