单选题The exhaust gases in a supercharged two-stroke/cycle diesel engine are expelled from the cylinder by （）Apumping action of the pistonBpressure of the fuel chargeCvacuum developed in the manifoldDpressure of the fresh air charge
单选题
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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