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單項(xiàng)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

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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

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

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