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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

For the intermediate condition, thermostats must be correctly set （）.

A.by trial and error
B.by and large
C.automatically
D.very easily

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