A.is primarily designed for vessels operating up to 50 miles offshore or on foreign waters
B.transmits a signal that can be detected by satellite
C.must be manually activated
D.operates in the medium and low frequency bands
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A.approved by the CCS
B.designed for float free，automatic activation
C.operated on 121.5/243 MHz
D.operated manually
A.a safety line attached to a man working over the side
B.used to measure water depth
C.used to slow the headway of a barge
D.used to measure the overhead height of a bridge
A.What
B.How
C.Which
D.When
A.How
B.What
C.Why
D.How about
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Radio beacon can be activated（）in case of distress.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.
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.
On-scene communications will normally take place between（）.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
Radio communication（）for many years and helps to save tens of thousands of lives.
All coast radio stations（）DSC installed for VHF and HF.