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单选题
All coast radio stations（）DSC installed for VHF and HF.
A
have
B
had
C
are having
D
have had
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单选题General radio communications in the global system are those between（）concerning the management and operation of the ships and may have impact on their safety.A
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orbiting satellites in spaceB
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单选题Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）A
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单选题To obtain accuracy in fixing by DF cross bearings，（）should be used.A
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考题
单选题Details of coast radio stations and radar stations can be found in（）.A
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only two persons may talk at the same timeC
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the radio only receives
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DSC provides reception of weather and navigational warnings plus search and rescue informationB
DSC provides low-cost，routine communications for the vessel operatorC
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考题
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A NAVTEX receiverB
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单选题Ship-to-ship distress alerting should be conducted by（）.A
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HYDROLANT/HYDROPACC
NAVAREAD
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a satellite communication systemC
a HF radio systemD
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exchangeB
to exchangeC
exchangingD
exchanged
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