单选题On a Mercator chart，1 nautical mile is equal to（）.A1 minute of longitudeB1 degree of longitudeC1 minute of latitudeD1 degree of latitude
单选题
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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