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單項(xiàng)選擇題

The abbreviation TDC means （）.

A.top dead center
B.temperature difference center
C.time delay dock
D.top diesel company

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單項(xiàng)選擇題

The abbreviation BDC means （）.

A.Boston Diesel Company
B.base circle diameter
C.switch board case
D.bottom dead center

單項(xiàng)選擇題

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

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