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
What information is NOT found in the chart title? （）
Every chart is liable to be incomplete（）.
The maximum difference between mean time and apparent time is （）.
The shoreline on charts generally represents the mean（）.
The soundings on the imperial chart are measured in（）.
When navigating in high latitudes and using a chart based on a Lambert conformal projection，（）.
The survey information upon which a chart is based is found （）.
Which chart symbol indicates the bottom is clay（）.
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（）.
Which aid is NOT marked on a chart with a magenta circle? （）