（） may have two emergency source of power, thus requiring two emergency switchboards.<br>A:Large passenger vessels<br>B:General cargo ships<br>C:Container ships<br>D:Oil tankers

（） may have two emergency source of power, thus requiring two emergency switchboards.
A:Large passenger vessels
B:General cargo ships
C:Container ships
D:Oil tankers

出自：海船船员证

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