单项选择题

Excessive diesel engine back pressure may be an indication of （）

A.carbon buildup in the exhaust manifold
B.overcooling of the exhaust manifold
C.eroded muffler baffle plates
D.high injection pressure

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单项选择题

A.early fuel injection
B.excessive bearing play within the running gear
C.overloading of the cylinder
D.all of the above

单项选择题

A.injection lag
B.ignition delay
C.compression
D.turbulence lag

单项选择题

A.a spark plug
B.injectors
C.the heat of compression
D.increasing jacket water temperatures