单项选择题
A.starting air pressure too high B.correct timing of starting air valves C.three of the six starting valves stuck D.the turning gear disengaged
Which of the following may cause that an engine doesnt ...
单项选择题Which of the following may cause that an engine doesnt run on starting air?（）
A.too low starting air pressure B.main start valve closed C.neither A nor B D.A and B
Which of the following is true about the fuel injection...
单项选择题Which of the following is true about the fuel injection with an ordinary diesel engine?（）
A.The process begins after TDC B.The process ends before TDC C.When the piston is near to the TDC the fuel injection ends D.None of the above is true
Which of the following is a factor of fuel oil almost h...
单项选择题Which of the following is a factor of fuel oil almost having nothing to do with the formation of combustion products?（）
A.setting point B.ash C.sulfur content D.carbon residues
