4. 如何確認蒸氣循環冷卻系統已填充適量的氟利昂 (A)玻璃視窗內無氣泡 (B)壓縮機負荷升高及轉速降低 (C)玻璃視窗內出現氣泡 (D)壓縮機負荷升高及轉速增加

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.