单选题Each lifebuoy shall be marked in block capitals of the Roman alphabet with（）of the ship.Athe call sign and nameBthe official number and nameCthe port of registry and nameDthe port of registry and official number
单选题
Each lifebuoy shall be marked in block capitals of the Roman alphabet with（）of the ship.
A
the call sign and name
B
the official number and name
C
the port of registry and name
D
the port of registry and official number
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