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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

Today, crankshafts for large 2-stroke crosshead engines are of the （）type.

A.semi-built
B.built-up
C.solid forged
D.individual forged

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