單項選擇題

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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單項選擇題

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

單項選擇題

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

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