A.TTT
B.SOS
C.The spoken word URGENCY
D.The spoken word PAN
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A.MAYDAY
B.PAN-PAN
C.SECURITE
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A.TTT
B.The spoken word PAN
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D.XXX
A.SOS
B.XXX
C.TTT
D.PAN
A.SOS
B.Mayday
C.Securite
D.PAN
A.SSS
B.TTT
C.XXX
D.FFF
最新試題
There is something wrong with our radar．All kinds of objects can’t be clearly（）within the definite range.
The use of the danger signal（）.
To prevent a wooden hull from leaking you caulk it（）.
In radiotelephone communications，the prefix PAN-PAN indicates that（）.
To develop maximum anchor holding power，the optimum angle between the anchor’s shank and the mooring lines is（）.
The radiotelephone safety message urgently concerned with safety of a person would be prefixed by the word（）.
We have no steel wire．You had better（）us one.
PAN-PAN repeated three times over the radiotelephone indicates which type of message will follow?（）
What is required to launch a boat stowed in a crescent davit?（）
What are symptom(s) of a ruptured appendix?（）