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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 > 船舶电气与船舶安全

单项选择题

Wear occurring at the tips of the reduction gear teeth is usually the result of （）.

A.surface fatigue
B.fretting corrosion
C.heavy overloading
D.gear misalignment

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