单项选择题

（）will form the basis for distress alerting and safety calling.

A.GMDSS
B.EGC
C.MSI
D.DSC

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单项选择题

A.local-mode coverage
B.SAR operation
C.data process
D.continuous broadcast

单项选择题

A.transmit distress signal
B.send response signal
C.transmit the signal of ship’s position
D.be started by X-band radar

单项选择题

A.the main source of energy
B.emergency source of electrical power
C.the reserve source of energy
D.all of above