单项选择题
For a diesel engine, when the piston is at the （）, the clearance volume is the largest.
A.TDC B.DTC C.BDC D.DBC
单项选择题 Fix the fuel injector into （） after repair.
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 （）.
