单项选择题
Maritime Safety Information（）International SafetyNet Service and NAVTEX Service.
A.consists of B.can be received C.is transmitted by D.Are made on
单项选择题 If the DSC controller is configured for MF/HF operation, the distress will be sent on（）.
单项选择题 Ship-to-ship distress alerting should be conducted by（）.
单项选择题 If a DSC distress relay is transmitted from coast station , it will（）.
