It is well known that the whole power distribution of the ship’s electrical services mainly depend on the（）.<br>A:sub-boards<br>B:main switchboards<br>C:emergency switchboards<br>D:distribution boards

It is well known that the whole power distribution of the ship’s electrical services mainly depend on the（）.
A:sub-boards
B:main switchboards
C:emergency switchboards
D:distribution boards

出自：海船船员证

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