Faulty operation of diesel engine fuel injection nozzles can be directly caused by （）.

A.water in the fuel oil supply
B.excessive fuel nozzle holder cooling
C.a distorted fuel spray pattern
D.leakage past the plunger into the oil drain

A.fuel pumps
B.cylinders
C.fuel strainers
D.all of above

A.low TBN value
B.high alkaline reserve
C.low flash point
D.high pour point