The exhaust gases in a supercharged two-stroke/cycle diesel engine are expelled from the cylinder by （）<br>A:pumping action of the piston<br>B:pressure of the fuel charge<br>C:vacuum developed in the manifold<br>D:pressure of the fresh air charge

The exhaust gases in a supercharged two-stroke/cycle diesel engine are expelled from the cylinder by （）
A:pumping action of the piston
B:pressure of the fuel charge
C:vacuum developed in the manifold
D:pressure of the fresh air charge

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