48. 發動機壓縮比之作用為何 (A) 用來限制最大的排氣溫度 (B) 指示發動機所產生的推力 (C) 用來相互檢驗最小容許推力

3. The maximum pressure altitude attainable (A) is limited by the maximum pressure differential the cabin will withstand. (B) may be found on the aircraft's Type Certificate Data Sheet. (C) is stamped on the outflow valve.