单选题Which of the following beneficial results can be expected from supercharging a previously naturally aspirated engine?（）AIncreased turbulenceBincreased mechanical efficiencyCIncreased brake mean effective pressureDAll of the above
单选题
Which of the following beneficial results can be expected from supercharging a previously naturally aspirated engine?（）
A
Increased turbulence
B
increased mechanical efficiency
C
Increased brake mean effective pressure
D
All of the above
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