单项选择题
The range of a MF coast station is normally（）nm.
A.20 to 30
B.200
C.100
D.450
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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 -
单项选择题
The beacon located on board aircraft is termed（）.
A.EPIRB
B.PLB
C.ELT
D.MCC -
单项选择题
（）is capable of finding any 406MHZ beacons no matter where they are.
A.Local User Terminal
B.Spacecraft
C.Local-mode coverage
D.Near polar orbiting satellites
