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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 > 船舶动力装置

单项选择题

The cylinder liners are made of （） and the cylinder surfaces are sometimes chromium-plated.

A.steel
B.copper
C.cast iron
D.stainless steel

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