单选题The source of energy fitted in GMDSS complying vessels must be（）.Athe main source of energyBemergency source of electrical powerCthe reserve source of energyDall of above
单选题
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
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