單項(xiàng)選擇題()are published for the correction of Admiralty Charts.

A.Admiralty Sailing Directions
B.Admiralty List of Signals
C.Mariner's Handbook
D.Admiralty Notices to Mariners


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2.單項(xiàng)選擇題Charts are subject to frequent correction according to ().

A.Notices to Mariners
B.Mariner's handbook
C.Sailing Directions
D.Guide to Port Entry

3.單項(xiàng)選擇題Contour elevations on this chart refer to heights in feet above mean ().

A.lower low water
B.high water
C.low water
D.sea level

4.單項(xiàng)選擇題Navigational charts are subject to frequent changes,the important ones of which are promulgated by ().

A.Admiralty Notices to Mariners
B.Mariner's Handbook
C.Catalogue
D.Sailing Directions