24.渦噴發動機雙軸流式壓縮器如何提高效率？(A)使用更多級數的渦輪 (B)降低燃燒室的溫度 (C)更高的壓縮比率 (D)更多的空氣進氣量

5. If an aircraft is operating at 40,000 ft. the pressurization ensures that (A)sea level pressure is maintained in the cabin. (B)the cabin pressure is progressively increased until the operational height is reached. (C)the cabin pressure above 10,000 ft. (D)the cabin pressure is equivalent to an altitude of less than 10,000 ft.