A.At least two years after the last entry
B.At least one year after the last entry
C.At least 90 days after the last entry
D.At least 30 days after the last entry
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A.LES
B.ESA
C.NCS
D.EGC
A.daily testing
B.either A or C
C.operational use of the equipment
D.testing at least every 48 hours
A.INMARSAT A
B.INMARSAT C
C.SafetyNET
D.NAVTEX
A.VHF
B.SART
C.NAVTEX
D.LES
A.Sea Area A1
B.Sea Area A2
C.Sea Area A3
D.Sea Area A4
最新試題
By using（）system a ship can send a distress message and know with certainty it will be received.
All coast radio stations（）DSC installed for VHF and HF.
As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
Radio communication（）for many years and helps to save tens of thousands of lives.
The rescue coordination center may（）on stations which interfere with traffic.
In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.
The frequency（）the safety message will be transmitted shall be included in DSC safety call.
Please use（）for（）.
（）will form the basis for distress alerting and safety calling.
The vessel has stayed in port for seven days because she needs（）.