单项选择题
A.1 February 1995 B.1 February 1992 C.1 July 1997 D.1 February 1999
In case a ship is in emergency or distress in any of 4 ...
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
Radio beacon can be activated()in case of distress.A.on...
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
If the beacon is mounted at a wrong place, it may()by s...
单项选择题If the beacon is mounted at a wrong place, it may()by sea water, chemicals, exhaust and vibrations.
A.be damaged B.work normally regardless of harmful conditions C.not wok though it is not in a bad condition