1 nautical mile is the lenth of an arc of a great circle which subtends an angel of（）at the center of the Earth.<br>A:1degree<br>B:1 minute<br>C:1second<br>D:1.5 degree

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

出自：海船船员证

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