单项选择题
A.setting tanks B.service tanks C.tanks D.drain tanks
In a typical fuel oil system, the oil is stored in tank...
单项选择题In a typical fuel oil system, the oil is stored in tanks in the double bottom from which it is pumped to （） and heated.
A.a service tank B.a collecting tank C.a sump D.a settling tank
In a purifier, the interface between the liquid seal an...
单项选择题In a purifier, the interface between the liquid seal and the oil should be positioned as close as possible to （）.
A.the outlet of oil B.the outlet of water C.the bowl periphery D.the center of bowl
In a purifier changing to a gravity disc with larger ho...
单项选择题In 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
