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單項(xiàng)選擇題

When started, a complete oily water separating unit is first filled （）The oily water mixture is then pumped through the inlet pipe into the coarse separating compartment.

A.with dirty water
B.with clean water
C.by oily water
D.by mixed water

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單項(xiàng)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

單項(xiàng)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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