Each emergency generator on a mobile offshore drilling unit，when tested，must be run under a full load for at least（）.<br>A:one hour<br>B:two hours<br>C:ten hours<br>D:four hours

Each emergency generator on a mobile offshore drilling unit，when tested，must be run under a full load for at least（）.
A:one hour
B:two hours
C:ten hours
D:four hours

出自：海船船员证

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