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單項(xiàng)選擇題

The range of a MF coast station is normally（）nm.

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

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單項(xiàng)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

單項(xiàng)選擇題

The beacon located on board aircraft is termed（）.

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