A.very rare
B.common
C.often
D.reasonable
您可能感興趣的試卷
你可能感興趣的試題
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 is NOT an advantage of the rhumb line track over a great circle track? （）
The maximum difference between mean time and apparent time is （）.
The numeral in the center of a wind rose circle on a pilot chart indicates the （）.
What information is found in the chart title? （）
A chart with a scale of 1:80，000 would fall into the category of a（）.
On chart，bearings to near objects should be used in preference to objects farther off，because（）.
（）is not a position-fixing system.
Every chart is liable to be incomplete（）.
A chart position enclosed by a square is a（n）（）.
The only cylindrical chart projection widely used for navigation is the （）.