A.Goonhilly, UK
B.Yamaguchi, Japan
C.Perth, Australia
D.Southbury, USA
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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
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
最新試題
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
On-scene communications will normally take place between（）.
All coast radio stations（）DSC installed for VHF and HF.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
By using（）system a ship can send a distress message and know with certainty it will be received.
（）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.
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.
The vessel has stayed in port for seven days because she needs（）.