单项选择题
A.Navigational broadcast B.weather forecast C.Urgency message D.Maritime Safety Information
（）is designed to send an automatic distress alert when ...
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
（）process the distress signal from EPIRB to determine i...
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
It is（）for mariners to combine the SART with a float-fr...
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
