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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 a purifier changing to a gravity disc with smaller hole diameter will move the interface towards the（）.

A.bowl periphery
B.bowl center
C.upper surface
D.lower surface

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单项选择题

For a purifier, changing to a gravity disc with larger hole diameter will move the interface towards the （）.

A.bowl periphery
B.bowl center
C.upper surface
D.lower surface

单项选择题

For many years marine centrifuges were designed for （） operation, that is the machines were run for a period during which solids accumulated in the bowlThe machine was stopped when the accumulated solids began to impair its performance.

A.purifying
B.batch
C.long period
D.temporary

单项选择题

When a clarifier is running the impurities and water collect at the bowl （）.

A.center
B.periphery
C.inlet
D.upper parts

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