A.20 to 30
B.200
C.100
D.450
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A.have received
B.have been received
C.are received
D.are being received
A.EPIRB
B.PLB
C.ELT
D.MCC
A.Local User Terminal
B.Spacecraft
C.Local-mode coverage
D.Near polar orbiting satellites
A.1992
B.1980
C.1984
D.1988
A.distress alerting
B.communication
C.broadcasting MSI
D.on-scene communication
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For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
Before GMDSS, if the radio officer on board is serious ill,（）.
Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.
We consider（）send a helicopter with medical facilities to the distress area.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
By using（）system a ship can send a distress message and know with certainty it will be received.
Please use（）for（）.
Every lifeboat which is fitted with a fixed two-way（）radiotelephone apparatus with an antenna which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.