A.by day or at night
B.almost round the clock
C.somewhat and sometime
D.from sunrise and sunset
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A.DF
B.Radar System
C.DSC System
D.COSPAS-SARSAT
A.nature of distress
B.type of assistance required
C.course and speed and time at which the information was recorded
D.A, B, C are all right
A.when two stations communicate with each other
B.in any radio system and at any time
C.when one ship sends a message to another station
D.for communication among some stations
A.VHF channels 16 and 13
B.Appropriate DSC distress and safety frequencies
C.INMARSAT TDM message channel
D.VHF channel 70 and channel 8
A.SAR party and the ship in distress
B.SAR authorities and the ship in distress and survival craft
C.A ship station and any coast station
D.Ship stations and shore-based communication network
最新試題
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
On-scene communications will normally take place between（）.
（）will form the basis for distress alerting and safety calling.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
Before GMDSS, if the radio officer on board is serious ill,（）.
The priority of EGC messages is classified by（）.
The rescue coordination center may（）on stations which interfere with traffic.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
Ship-to-ship distress alerting should be conducted by（）.