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
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The abbreviation TDC means （）.
A.top dead center
B.temperature difference center
C.time delay dock
D.top diesel company -
单项选择题
The abbreviation BDC means （）.
A.Boston Diesel Company
B.base circle diameter
C.switch board case
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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.
A.needle valve
B.nozzles
C.piston
D.spring
