A.essential
B.compulsory
C.optional
D.inadvisable
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A.Satellite network
B.Satellite link
C.GMDSS
D.Satellite system
A.easy/reliable
B.difficult/cheap
C.stable/compulsory
D.easy/expensive
A.MCC/LUT/RCC
B.LUT/MCC/RCC
C.LUT/RCC/MCC
D.LUT/RCC/LUT
A.at sea
B.on land
C.in the air
D.throughout the world
A.COSPAS-SARSAT
B.ground receiving stations
C.spacecraft
D.satellite SAR instrument
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All coast radio stations（）DSC installed for VHF and HF.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
（）will form the basis for distress alerting and safety calling.
On-scene communications will normally take place between（）.
Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.
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.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
Before GMDSS, if the radio officer on board is serious ill,（）.
COSPAS-SARSAT is intended to be used for（）.