单项选择题
Distress signal are always stored in the memory so as to start（）.
A.local-mode coverage B.SAR operation C.data process D.continuous broadcast
单项选择题 When the power of SART is on, it will（）.
单项选择题 The source of energy fitted in GMDSS complying vessels must be（）.
单项选择题 The NCS of INMARSAT-A system in the IOR is in（）.
