A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）<br>A:has little or no internal friction<br>B:has a lower effective compression ratio<br>C:operates with scavenge air under a positive pressure<br>D:operates without energy absorbing intake and exhaust strokes

A two-stroke/cycle diesel engine requires less starting air than a four-stroke/cycle diesel engine, of equal displacement, because the two-stroke/cycle diesel engine（）
A:has little or no internal friction
B:has a lower effective compression ratio
C:operates with scavenge air under a positive pressure
D:operates without energy absorbing intake and exhaust strokes

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