单项选择题
Fix the fuel injector into （） after repair.
A.the cylinder liner B.the cylinder cover C.the cylinder jacket D.the piston
单项选择题 Failure of fuel injection is usually due to trouble in the （）.
单项选择题 Factor influencing the position of the interface between the liquid seal and the oil in a purifier is （）.
单项选择题 Expansion tank should be used to remove （） from cooling water.
