单项选择题
A.line up the engine fore restarting with light diesel oil
B.reposition the fuel injection cam
C.change the intake and exhaust valve cam positions
D.place the starting cam in the intermediate position
单项选择题 Which of the listed conditions can cause lacquer to be deposited on a piston skirt?（）
单项选择题 Reducing the clearance between a valve stem and rocker arm will result in the valve （）
单项选择题 If you increase the clearance between a valve stem and rocker arm, which of the listed condition will occur?（）