单项选择题

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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A.Ⅰ only
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D.neither Ⅰ or Ⅱ

船舶电气与船舶安全

Which of the following beneficial results can be expected from supercharging a previously naturally aspirated engine?（）