A.180E above the equator
B.64.5 E over the IOR
C.15.5W along the straight line
D.55.5W above the equator
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A.complicated circumstances
B.changeable atmospheric pressure
C.large density of traffic
D.some strong signals from unwanted satellites
A.besides the polar regions
B.including the North Pole and the South Pole
C.above 70N and below 70S
D.as far north and south 70
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
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
最新試題
Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
The priority of EGC messages is classified by（）.
The advantage of geostationary satellites is（）.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
（）will form the basis for distress alerting and safety calling.
Before GMDSS, if the radio officer on board is serious ill,（）.
（）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.
All coast radio stations（）DSC installed for VHF and HF.