A.55.5W
B.64.5E
C.15.5W
D.178E
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A.two
B.three
C.more than two
D.more than three
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 is always terrible
B.the condition there is complicated
C.the signals are too strong
D.their SES may recive the signals from unwanted satellite
A.international NAVTEX Service
B.FleetNET Service
C.SafetyNet Service
D.WWNWS
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The vessel has stayed in port for seven days because she needs（）.
Radio communication（）for many years and helps to save tens of thousands of lives.
Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.
COSPAS-SARSAT is intended to be used for（）.
The rescue coordination center may（）on stations which interfere with traffic.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.
Distress traffic is the communication（）between the station in distress and the ships, aircraft, coast radio stations, coast earth stations and rescue centers participating in the rescue work.
We consider（）send a helicopter with medical facilities to the distress area.
（）will form the basis for distress alerting and safety calling.