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單項(xiàng)選擇題

（）is designed to send an automatic distress alert when a ship sinks suddenly.

A.Lifeboat
B.A survival craft
C.An EPIRB
D.A SART

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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

單項(xiàng)選擇題

It is（）for mariners to combine the SART with a float-free satellite EPIRB.

A.essential
B.compulsory
C.optional
D.inadvisable

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