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單項選擇題

In an oily water separator the oil will travel （） to the oil collecting spaces.

A.upwards
B.downwards
C.outwards
D.forwards

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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

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

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