形成风的原动力是

判断正误True or False:
CRJ900驾驶舱内有3个氧气面罩。There are 3oxygen masks in thecockpit of CRJ900 aircraft.

在地面，飞行机组操作哪些设备必须获得地面人员许可或确认地面设备及人员已撤离？On ground, when operating the following equipment, the flight crew must obtain ground crew permission or confirm that the ground equipment and personnel have left:

危险品运输中，第一类是什么属性的物体？

A. 易燃液体

B. 易燃固体

C. 爆炸品气体

在进入快速脱离道地速大于多少节持续两秒时触发蓝色事件？

A. 30

B. 35

C. 40

判断正误True or False: 在出现风切变警告或按压了任一油门杆上的TOGA（起飞/复飞）电门时，飞行指引仪指令杆自动提供改出指引。Flight director command bars provide escape guidance automatically when a windshear warning occurs or when either TOGA (take-off/go-around) switch on either thrust lever is pressed.

发动机在 V1 或 V1 后失效，起始爬升阶段，在达到正上升率后，收轮。保持速度 ( )爬升直至加速高度。When engine Failure at/after V1，retract the landing gear after attaining a positive rate of
climb. maintain a minimum of ( )speed to climb to the acceleration altitude.

A. V1

B. Vr

C. V2

D. V2+10

当座舱高度达到（）英尺，所有氧气面罩盒子的门会自动打开，连着系索的氧气面罩掉下来。When the cabin altitude reaches ( ) feet, the doors of all oxygen mask bin will automatically open, and the oxygen mask attached to the lanyard will dropl down

A. 8500

B. 10000

C. 14000

D. 8000

当航空承运人的飞机发生发动机失效，或者为防止可能的损坏而停止发动机运转时，机长在通常情况下应采取下列哪一措施?

A. 经公司飞行签派员批准可继续飞往计划的目的地机场

B. 按飞行时间在距离最近的能安全着陆的合适机场着陆

C. 立即改航飞往最近可进行维修的机场

(多选)DCU 进行数据处理后，将这些数据通过 ARINC 数据总线传递给______部件：（multiple-choice）The DCUs process and format information received then transmit the data onthe ARINC bus to ____.

A. EICAS 显示器，EICAS displays

B. 灯光驱动单元（LDU），Lamp driver unit (LDU)

C. 维修诊断计算机（MDC），Maintenance diagnostic computer (MDC)

D. 飞行数据记录器（FDR），Flight data recorder (FDR)

（案例分析）2017年9月3日，某机组驾驶飞机执行扎兰屯-海拉尔航班，在海拉尔最后进近阶段副驾驶接到管制指令的同时，机长下达指令“打铃，放轮，襟翼30”，副驾驶接到机长指令“打铃，放轮，襟翼30”后，由于疏忽，在场高1748ft选择45°襟翼，但未放下起落架手柄，机组发现起落架未放下后复飞。二次进近正常落地。请问机组可能存在哪些问题？(Case Analysis) On September 3, 2017, a certain crew flew the aircraft to carry out the Zhalantun-Hailar flight. At the same time as the copilot received the control instruction during the final approach phase of Hailar, the captain gave the instruction "Ring, gear down, and flaps 30”, after receiving the command from the captain “Ring, gear down, and flaps 30”, the copilot, due to negligence, selected the flaps 45° at 1748ft AGL, but the landing gear lever was not selected down. The flight crew found the abnormal situation of landing gear and excuted a missed approach. The second approach was made and ended with a normal landing. What possible problems may exist shown by the flight crew?