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

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单项选择题

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

单项选择题

A.setting point
B.ash
C.sulfur content
D.carbon residues

单项选择题

A.1-2-3-4-5-6
B.1-2-3-6-5-4
C.1-5-3-6-2-4
D.1-3-4-5-6-2