A.very rare
B.common
C.often
D.reasonable
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A.SW of Cocos Islands
B.oceanic dangers or seamounts
C.undiscovered dangers
D.the continental shelf
A.a small error in bearing or in laying it down on the chart has a greater effect in misplacing the position the longer the line to be drawn
B.all scales are kept updated for vital information by Notices to Mariners
C.the larger the scale of the chart，the greater the detail that can be shown on it
D.the mariner using the medium scale charts for passage along a coast need not transfer on to a large scale for short distances
A.1 minute of longitude
B.1 degree of longitude
C.1 minute of latitude
D.1 degree of latitude
A.the final judge of the reliance the mariner can place on the information given
B.its immediate importance cannot always be verified before promulgation
C.through imperfections in the survey on which it is based，or subsequent alterations to the topography or sea floor
D.deferring the promulgation of certain less important information
A.National Geospatial-Intelligence Agency
B.Coast Guard
C.Naval Observatory
D.National Ocean Service
最新試題
The description Racon beside an illustration on a chart would mean a （）.
The short-long dashed，magenta lines parallel to York River Entrance Channel mark（）．
The short-long dashed magenta line around Gardiners Island marks（）.
What defines a great circle? （）
Which information is found in the chart title（）.
A chart projection depicting the poles and a small area on either side of a connecting meridian，that is sometimes used for star charts，is the（）.
That the scale of any part of a chart to be larger than the scale of the survey is（）.
When a buoy is in position only during a certain period of the year，where may the dates when the buoy is in position be found?（）
The soundings on the imperial chart are measured in（）.
On chart，bearings to near objects should be used in preference to objects farther off，because（）.