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.A1degreeB1 minuteC1secondD1.5 degree
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
1degree
B
1 minute
C
1second
D
1.5 degree
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