A.alternation
B.alternate
C.alter
D.alternative
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A.all ships in a large sea area
B.only the sea authorities ashore
C.the SAR units ashore and at sea
D.the port radios and the coast stations
A.some
B.lots of
C.many
D.all
A.impossible
B.possible
C.easy
D.difficult
A.climate
B.sunshine
C.human beings
D.both a and b
A.One means, whether satellite or terrestrial techniques
B.Two means, whether satellite or terrestrial techniques
C.Two separate and independent means, each using different radio communication services
D.Two means, such as MF DSC and HF DSC
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For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.
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.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
Ship-to-ship distress alerting should be conducted by（）.
Radio communication（）for many years and helps to save tens of thousands of lives.
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.
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（）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.