单项选择题
A.camshaft seizure
B.lube oil pump failure
C.lube oil cooler failure
D.lube oil pump overflow
单项选择题 Which of the following problems is the main source of fuel pump and injection system malfunctions?（）
单项选择题 Which of the following faults would allow lube oil to enter the cooling system of a diesel engine?（）
单项选择题 Problems with the diesel engine fuel injection pump are usually caused by（）