单项选择题
A.bowl periphery B.bowl center C.upper surface D.lower surface
For a purifier, changing to a gravity disc with larger ...
单项选择题For a purifier, changing to a gravity disc with larger hole diameter will move the interface towards the （）.
For many years marine centrifuges were designed for （） ...
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
When a clarifier is running the impurities and water co...
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
