A.approved by the CCS
B.designed for float free，automatic activation
C.operated on 121.5/243 MHz
D.operated manually
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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
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All coast radio stations（）DSC installed for VHF and HF.
Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
（）will form the basis for distress alerting and safety calling.
The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.
COSPAS-SARSAT is intended to be used for（）.
Please use（）for（）.
SOLAS ships shall be equipped with（）.
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.