单选题When receiving a distress alert, the SAR authorities ashore and the ships in the vicinity of the ship in distress will（）in a coordinated search and rescue operation with the minimum delay.AassistBsend a rescueCsearch the distress areaDReach the distress position at once
单选题
When receiving a distress alert, the SAR authorities ashore and the ships in the vicinity of the ship in distress will（）in a coordinated search and rescue operation with the minimum delay.
A
assist
B
send a rescue
C
search the distress area
D
Reach the distress position at once
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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
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单选题What is the primary purpose for Digital Selective Calling (DSC)?（）ADSC provides reception of weather and navigational warnings plus search and rescue informationBDSC provides low-cost，routine communications for the vessel operatorCDSC is to be used for transmitting and receiving distress alerts to and from other ships or coast radio stations via radioDThis aids SAR authorities in tracking a vessel's position by satellite
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