单项选择题
A.the outlet of oil
B.the outlet of water
C.the bowl periphery
D.the center of bowl
单项选择题 In a purifier changing to a gravity disc with larger hole diameter will move the interface towards the （）.
单项选择题 In a marine diesel engine the oil sump is （）.
单项选择题 In a general oil cooler circulated by sea water, the oil is at a higher pressure, the result being that any leak in the cooler will mean a loss of （）.