單項選擇題Every radio installation shall be clearly marked with the（）, the ship station identity and other codes as applicable for the use of the radio installation.

A.call sign
B.port of register
C.radio name
D.signal label


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2.單項選擇題（）process the distress signal from EPIRB to determine its position and identity.

A.COSPAS-SARSAT
B.ground receiving stations
C.storing distress signal
D.Near polar orbiting satellites

3.單項選擇題The range of a MF coast station is normally（）nm.

A.20 to 30
B.200
C.100
D.450

4.單項選擇題Exchange of answer-backs acts a confirmation that the messages（）at the destination.

A.have received
B.have been received
C.are received
D.are being received

5.單項選擇題The beacon located on board aircraft is termed（）.

A.EPIRB
B.PLB
C.ELT
D.MCC