单项选择题
A.air turbulence B.fuel penetration C.fuel spray angle D.fuel injection rate
Scale and dirt accumulation in the waterside of a lube ...
单项选择题Scale and dirt accumulation in the waterside of a lube oil cooler will be indicated by a gradual increase in the lube oil（）.
A.TBN number B.viscosity C.temperature D.foaming
The lower section of a piston is called the （）.A.landB....
单项选择题The lower section of a piston is called the （）.
A.land B.skirt C.crown D.plate
The diesel engine valve subjected to most severe condit...
单项选择题The diesel engine valve subjected to most severe conditions of service is the （）.
A.cylinder exhaust valve B.air starting valve C.air inlet valve D.cylinder relief valve
