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
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
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.
Please use（）for（）.
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
SOLAS ships shall be equipped with（）.
Radio communication（）for many years and helps to save tens of thousands of lives.
（）by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.
The vessel has stayed in port for seven days because she needs（）.
By using（）system a ship can send a distress message and know with certainty it will be received.
We consider（）send a helicopter with medical facilities to the distress area.