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全部科目 > 水路交通运输技能考试 > 海船船员考试 > 船舶管理(轮机专业) > 轮机英语 > 船舶辅助机械

单项选择题

The boiler is fired （） the demand for steam exceeds that available from exhaust gas heating.

A.whenever
B.however
C.wherever
D.whether

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