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
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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
A.400
B.240
C.450
D.180
A.on the bridge
B.in the coast station
C.on the forecastle
D.on starboard side
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The advantage of geostationary satellites is（）.
Every lifeboat which is fitted with a fixed two-way vhf radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
All coast radio stations（）DSC installed for VHF and HF.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
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.
Radio communication（）for many years and helps to save tens of thousands of lives.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.