单项选择题
With respect to the flow of lubricating oil through a diesel engine, the lube oil coolers are located after filters in order to （）.
A.allow filtration of less viscous oil B.decrease the pressure drop across the filter C.improve overall filtration D.all of the above
单项选择题 The bearings used to support the crankshaft are generally called （）
单项选择题 Improper maintenance of an automatic auxiliary boiler oil burner could result in （）.
单项选择题 The highest pressure in any closed diesel engine freshwater cooling system is at the （）.
