A.taking the place of the radio system
B.introducing a new life-saving system
C.saving the vessels in distress
D.improving the communication on land
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A.was suffering
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最新試題
On-scene communications will normally take place between（）.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
Ship-to-ship distress alerting should be conducted by（）.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
Distress traffic is the communication（）between the station in distress and the ships, aircraft, coast radio stations, coast earth stations and rescue centers participating in the rescue work.
All coast radio stations（）DSC installed for VHF and HF.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
Every lifeboat which is fitted with a fixed two-way vhf radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.