单项选择题
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
A.sometimes
B.all times
C.never
D.partly
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相关考题
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单项选择题
The identification character of each Navtex station is regarded as（）to the messages.
A.the only preamble
B.a part of the preamble
C.the closing
D.the suspension -
单项选择题
Exchange of answerbacks act s a confirmation that the messages（）at the destination.
A.have received
B.have been received
C.are received
D.are being received -
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
