43.渦輪發動機使用高電壓點火系統，其電壓脈衝來自下列何者？ (A)主線圈 (B)整流器 (C)變壓器的觸發器 (D)發電機

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.