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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

As for a hydraulic single action vane pump, the inner wall of the stator is usually of （） shape.

A.circular
B.elliptical
C.rectangular
D.hexagon

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