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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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考题
单选题On a nautical chart，the inner ring of a compass rose indicates（）.A
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compass errorC
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Vector chart formatB
Raster chart dataC
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1 minute of longitudeB
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latitude scale near the middle of the track lineB
longitude scale near the middle of the track lineC
latitude scale at the midlatitude of the chartD
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Variation is not indicated on small-scale nautical charts
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EquatorB
Areas including both North and South latitudesC
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polyconic projectionD
rectangular projection
考题
单选题1 nautical mile is the lenth of an arc of a great circle which subtends an angel of（）at the center of the Earth.A
1degreeB
1 minuteC
1secondD
1.5 degree
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