单项选择题
A.a cracked cylinder head
B.a leaky cylinder head gasket
C.a cracked cylinder liner
D.any of the above
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 （）
单项选择题 Starting air valves are held firmly on their seats by（）