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
Radio communication（）for many years and helps to save tens of thousands of lives.
All coast radio stations（）DSC installed for VHF and HF.
On-scene communications will normally take place between（）.
SOLAS ships shall be equipped with（）.
The rescue coordination center may（）on stations which interfere with traffic.
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.
We consider（）send a helicopter with medical facilities to the distress area.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.