The source of energy fitted in GMDSS complying vessels must be（）.<br>A:the main source of energy<br>B:emergency source of electrical power<br>C:the reserve source of energy<br>D:all of above

The source of energy fitted in GMDSS complying vessels must be（）.
A:the main source of energy
B:emergency source of electrical power
C:the reserve source of energy
D:all of above

出自：海船船员证

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