单项选择题 If water is found in the crankcase of a diesel engine, the cause may be due to（）

单项选择题 Following an overhaul of a crosshead type diesel engine, the engine is jacked over with the turning gear as part of the pre-start procedure, which of the listed pre-start procedures should be carried out?（）

单项选择题 Fuel oil is regularly transferred to the day tank in order to （）