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
单项选择题 The NAVTEX receiver can be mounted on（）.
单项选择题 （）will normally provide sufficient information to seaward of fairway buoy or pilot station.
单项选择题 MSI stands for（）.
