單項(xiàng)選擇題

On a Mercator chart，1 nautical mile is equal to（）.

A.1 minute of longitude
B.1 degree of longitude
C.1 minute of latitude
D.1 degree of latitude

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Every chart is liable to be incomplete（）.

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

單項(xiàng)選擇題

Charts showing the coast of Mexico are produced by the United States（）.

A.National Geospatial-Intelligence Agency
B.Coast Guard
C.Naval Observatory
D.National Ocean Service