单项选择题
A.sludge B.water C.micro-organism growth D.all of the above
Excessively worn, or polished ends on a diesel engine v...
单项选择题Excessively worn, or polished ends on a diesel engine valve spring, indicate（）
A.burned exhaust valves B.excessive spring compression C.spring surge D.worn valve seats
A loud clicking noise from the valve compartment of an ...
单项选择题A loud clicking noise from the valve compartment of an operating diesel engine would indicate（）
A.worn valve seats B.worn main bearing C.excessive valve clearance D.weak rocker arm springs
In the cylinder of a diesel engine fuel is ignited by t...
单项选择题In the cylinder of a diesel engine fuel is ignited by the（）
A.spark from a plug in the pre-combustion chamber B.electrical discharge from the distributor C.heat of compression within the cylinder D.heat from the fuel injection nozzle
