单项选择题
A.clearance between the top of the valve stem and the rocker arm
B.compression of the valve springs
C.clearance between the valve seat inserts and the head
D.out of roundness of the fuel injection cams
单项选择题 Auxiliary diesel engines can be automatically shut down as a result of （）
单项选择题 Which of the listed conditions can cause a diesel engine to use too much lube oil?（）
单项选择题 Which of the following operational conditions will occur to the diesel engine lube oil at extremely high temperature?（）