A.daily testing
B.either A or C
C.operational use of the equipment
D.testing at least every 48 hours
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A.INMARSAT A
B.INMARSAT C
C.SafetyNET
D.NAVTEX
A.VHF
B.SART
C.NAVTEX
D.LES
A.Sea Area A1
B.Sea Area A2
C.Sea Area A3
D.Sea Area A4
A.Search and rescue authorities ashore can be alerted to a distress situation
B.Shipping in the immediate vicinity of a ship in distress will be rapidly alerted
C.Shoreside authorities and vessels can assist in a coordinated SAR operation with minimum delay
D.All of the above
A.No action is necessary，as the DSC control unit will automatically switch to the NBDP follow-on communications frequency
B.The operator should immediately set continuous watch on the radiotelephone frequency that is associated with the frequency band on which the distress alert was received
C.The Operator should immediately set continuous watch on VHF channel 70
D.The Operator should immediately set continuous watch on the NBDP frequency that is associated with the frequency band on which the distress alert was received
最新試題
（）by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.
We consider（）send a helicopter with medical facilities to the distress area.
Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
Please use（）for（）.
COSPAS-SARSAT is intended to be used for（）.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
The advantage of geostationary satellites is（）.