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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Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.
A.1 February 1995
B.1 February 1992
C.1 July 1997
D.1 February 1999 -
单项选择题
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
A.MF/HF
B.SART
C.EPIRB
D.any of A, B, C -
单项选择题
Radio beacon can be activated（）in case of distress.
A.only automatically
B.only manually
C.both automatically and manually
D.only by remote control
