问题
单项选择题
The distance between the two NAVTEX stations with the same B1 character should be not exceed（）nautical miles.
A.400
B.240
C.450
D.180
答案
参考答案：C
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The distance between the two NAVTEX stations with the same B1 character should be not exceed（）nautical miles.
A.400
B.240
C.450
D.180
参考答案：C