A.Space segment, NCC, RCC, SES and CES
B.Space Segment, a satellite system, C system, NCC and NCS
C.Space Segment, NCC, NCS,CES and SES
D.A system, C system, satellite system, earth stations and NCS
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A.4
B.9
C.8
D.5
A.the weather over there is always terrible
B.the condition there is complicated
C.the signals are too strong
D.their SES may receive the signals from unwanted satellite
A.sometimes
B.all times
C.never
D.partly
A.the only preamble
B.a part of the preamble
C.the closing
D.the suspension
A.have received
B.have been received
C.are received
D.are being received
最新試題
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
We consider（）send a helicopter with medical facilities to the distress area.
（）will form the basis for distress alerting and safety calling.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
On-scene communications will normally take place between（）.
Radio communication（）for many years and helps to save tens of thousands of lives.
All coast radio stations（）DSC installed for VHF and HF.
Radio beacon can be activated（）in case of distress.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.