A.COSPAS-SARSAT
B.ground receiving stations
C.storing distress signal
D.Near polar orbiting satellites
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A.20 to 30
B.200
C.100
D.450
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
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Radio beacon can be activated（）in case of distress.
Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.
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.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
（）will form the basis for distress alerting and safety calling.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
At least two two-way VHF radiotelephone apparatus shall be provided on every cargo ship of（）tons gross tonnage and upwards but less than 500 tons gross tonnage.
Please use（）for（）.