单项选择题
Distress signal are always stored in the memory so as to start（）.
A.local-mode coverage B.SAR operations C.data process D.continuous broadcast
单项选择题 Which Inmarsat system applies store-and-forward messaging?（）
单项选择题 （）are operated as a secondary method of alerting in the GMDSS.
单项选择题 The maritime access code of telephone mode in INMARSAT-A terminal for the IOR is（）.
