问题
单项选择题
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
答案
参考答案：B
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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
参考答案：B