單項(xiàng)選擇題When receiving a distress alert, the SAR authorities ashore and the ships in the vicinity of the ship in distress will（）soonest.
A.reach the distress area
B.conduct a sector search
C.send rescue vessels
D.assist coordinately in SAR operation
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1.單項(xiàng)選擇題In the GMDSS, distress alerting can be transmitted in（）directions.
A.1
B.2
C.3
D.4
2.單項(xiàng)選擇題We（）the distress signal on our own radio before the shore station relayed it to us.
A.received alreadly
B.have received
C.had received
D.was receiving
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By using（）system a ship can send a distress message and know with certainty it will be received.
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If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
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On-scene communications will normally take place between（）.
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SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
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For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
題型：?jiǎn)雾?xiàng)選擇題