单选题DSC distress acknowledgements are normally transmitted by（）in respond to a receiver DSC distress call.AShip stationsBCoast stationsCNCSsDNCC
单选题
DSC distress acknowledgements are normally transmitted by（）in respond to a receiver DSC distress call.
A
Ship stations
B
Coast stations
C
NCSs
D
NCC
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DSC遇险呼叫时,它的格式符£¯类别是()。 A、Distress/distressB、allship/DistressC、Distress/ALL shipD、All ship/All ship
Which frequencies and modes are allocated for distress alerting in GMDSS ________．A.406 MHz via EPIRBB.1626.5-1645.5 via INMARSATC.Channel 70 DSC plus six（6）MF/HF DSC frequenciesD.All of the above
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单选题The distress message of a ship should include considerable information which might facilitate the rescue. This information should（）.AALWAYS be included in the initial distress messageBbe sent to a Coast Guard station FIRSTCbe transmitted as a series of short messages，if time allowsDinclude the vessel's draft
单选题If no distress acknowledgement is received（）a DSC distress call transmission, then the ship in distress may repeat the DSC distress call attempt after a delay of between 3.5 and 4.5 minutes from the beginning of the initial call.Arelevant toBrelate toCin response toDin relation to
单选题On-scene communications will normally take place between（）.Aship in distress and assisting unitsBNCS and RCCCRCCs and „0n-scene commander‟ or “co-ordinator surface search”Dship in distress and coast station
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单选题What is the action that a GMDSS Radio Operator should take when a DSC distress alert is received? （）ANo action is necessary，as the DSC control unit will automatically switch to the NBDP follow-on communications frequencyBThe operator should immediately set continuous watch on the radiotelephone frequency that is associated with the frequency band on which the distress alert was receivedCThe Operator should immediately set continuous watch on VHF channel 70DThe Operator should immediately set continuous watch on the NBDP frequency that is associated with the frequency band on which the distress alert was received
单选题If a ship station relays a DSC distress call to an appropriate coast station, it means that（）.Athe ship has received the DSC distress call on a HF frequencyBthe coast station concerned has not acknowledged it within 5 minutesCthe ship will take command of search and rescue in 5 minutesDA and B
单选题If a DSC distress relay is transmitted from coast station , it will（）.Aindicate the ship in distress that the alert has been receivedBalert ships in the area of a distress incident that a distress has occurredCinform other coast station of distress incidentDrepeat the distress alert in 5 minutes
单选题If a GMDSS radio operator initiates a DSC distress transmission but does not insert a message，what happens? （）AThe transmission is aborted and an alarm sounds to indicate this data must be provided by the operatorBThe transmission is not initiated and ERROR is indicated on the display readoutCThe transmission will be made with default information provided automaticallyDThe receiving station will poll the DSC unit of the vessel in distress to download the necessary information
单选题It is required that ships proceeding at sea should keep continuous watch on（）.AVHF channels 16 and 13BAppropriate DSC distress and safety frequenciesCINMARSAT TDM message channelDVHF channel 70 and channel 8
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单选题What does the DSC control unit do if the GMDSS radio operator fails to insert updated information when initiating a DSC distress alert?（）AIt will abort the transmission and set off an audible alarm that must be manually resetBIt will initiate the DSC distress alert but，as no information will be transmitted，rescue personnel will not be able to identify the vessel，its position or its situationCIt will initiate the DSC distress alert and default information will automatically be transmittedDIt will initiate the DSC distress alert，but any station receiving it will have to establish contact with the distressed vessel to determine its identity，position and situation