9. 飛機的磁羅盤何時需要校正，並更新羅盤校正卡？ (A)在每日檢查後 (B)在羅盤有擦拭後 (C)在更換磁通閥後 (D)飛機斷電後

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.