单项选择题
The amount of lubricating oil in the drain tank should be checked by （）.
A.measuring B.sounding rod C.metering D.weighting
单项选择题 The abbreviation TDC means （）.
单项选择题 The abbreviation BDC means （）.
单项选择题 The （） in the injector will lift at a pre-set pressure which ensures that the fuel will atomize once it enters the cylinder.
