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單項(xiàng)選擇題

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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

Which of the following firing order may be used for an 6 cylinder engine?（）

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