单项选择题
From the ship owner’s point of view,（）is the most important advantage Inmarsat providing with.
A.business opportunity B.good-quality radio telephone conversations C.telex service D.both B and C
单项选择题 Ships sailing in（）are able to receive and print out EGC message.
单项选择题 As each MSI message will have a unique identity, the printing of messages already received correctly is（）.
单项选择题 DSC distress acknowledgements are normally transmitted by（）in respond to a receiver DSC distress call.
