13.What ratio could be treated as the mechanical efficiency of a diesel engine?
(A)Brake mean effective pressure / Indicator mean effective pressure
(B)Indicator mean effective pressure / Brake mean effective pressure
(C)Mean effective pressure / Cycle maximum pressure
(D)Cycle maximum pressure / Cycle compression pressure

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統計： A(88), B(36), C(33), D(20), E(0) #577735