单项选择题
（）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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相关考题
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单项选择题
（）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 -
单项选择题
It is（）for mariners to combine the SART with a float-free satellite EPIRB.
A.essential
B.compulsory
C.optional
D.inadvisable -
单项选择题
（）is a space system using one or more artificial earth satellites.
A.Satellite network
B.Satellite link
C.GMDSS
D.Satellite system
