单项选择题
（）will form the basis for distress alerting and safety calling.
A.GMDSS B.EGC C.MSI D.DSC
单项选择题 Distress signal are always stored in the memory so as to start（）.
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（）.
