A.Admiralty Sailing Directions
B.Admiralty List of Lights
C.Admiralty List of Signals
D.Admiralty Notices to Mariners
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A.corrections
B.publications
C.supplements
D.alterations
A.enforces
B.cancels
C.corrects
D.replenishes
A.horizontal
B.vertical
C.diagonal
D.vertical or diagonal
A.publications
B.notices to mariners
C.supplements
D.Annual Summary of Admiralty Notices to Mariners
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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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 period at high or low tide during which there is no change in the height of the water is called the （）.
Clearance gauges at bridges indicate （）.
AFTER DROPPING THE PILOT means （）.
During a period of whiteout，you should expect which of the following（）.
The Earth has the shape of a(n) （）.
Conditions for crossing a rough bar are usually best at （）.
Attention is called to the fact that in many cases charted depths may be decreased by up to （）.
The Earth’s irregular heating is caused by （）.
An occulting light is one in which （）.