问题
单项选择题
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
答案
参考答案：B
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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
参考答案：B