A.distress and safety radio communication purposes
B.life-saving purpose
C.GMDSS requirements
D.emergency position
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A.Q-code
B.Telephone numbers and addresses
C.the international Codes of Signals
D.radio instructions
A.digital codes
B.code messages
C.norse codes
D.distress messages
A.DSC
B.MSI
C.EGC
D.NBDP
A.Navigational broadcast
B.weather forecast
C.Urgency message
D.Maritime Safety Information
A.Lifeboat
B.A survival craft
C.An EPIRB
D.A SART
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Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
COSPAS-SARSAT is intended to be used for（）.
International Navtex service means the coordinated broadcast and automatic reception on（）khz of maritime safety information by narrow-band direct-printing telegraphy using English language.
By using（）system a ship can send a distress message and know with certainty it will be received.
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.
Ship-to-ship distress alerting should be conducted by（）.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
SOLAS ships shall be equipped with（）.
All coast radio stations（）DSC installed for VHF and HF.
（）will form the basis for distress alerting and safety calling.