单项选择题

International Navtex service means the coordinated broadcast and automatic reception on（）khz of maritime safety information by narrow-band direct-printing telegraphy using English language.

A.518
B.2182
C.156.8
D.2187.5

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单项选择题

A.1 February 1995
B.1 February 1992
C.1 July 1997
D.1 February 1999

单项选择题

A.MF/HF
B.SART
C.EPIRB
D.any of A, B, C

单项选择题

A.only automatically
B.only manually
C.both automatically and manually
D.only by remote control