关于平流雾，下列哪种说法是正确的

风吹来时，那种局地风向不断改变，风速一阵大一阵小的现象称为

A. 阵风；

B. 风切变；

C. 风向不定

空中尝试启动发动机时，ITT必须低于多少度？ITT must be below ____ °C before attempting to air start engine.

A. 80 °C

B. 85 °C

C. 90 °C

D. 95 °C

正驾驶和副驾驶的操纵盘上的R/T-I/C按钮：The pilot’s and copilot’s control wheel R/T-I/C switches:

A. 控制头顶扩音器的音频输出control the audio output of overhead speakers

B. 当音频整合系统失效时使用Are used when a failure of the audio integrating system occurs

C. 能选择收发机的SIMPLEX或DUPLEX操作Can select either SIMPLEX or DUPLEX operation of the transceivers

D. 激活吊杆或面罩麦克风并提供热麦（机内直接通话）Activate the boom or mask microphone and provide hot mike operation

当飞机的ACN值和跑道的PCN值之间是什么关系时，才能使用跑道？

A. ACN等于或大于PCN

B. CAN大于PCN

C. ACN等于或小于PCN

油箱内的燃油温度被位于哪里的燃油温度传感器持续监控？The temperature of fuel in tanks is continuously monitored by a fuel temperature sensor installed where?

A. 右机翼油箱 Right wing tank

B. 中央油箱 Center tank

C. 左机翼油箱 Left wing tank

D. 以上全部All of the above

空中双发失效后，有哪几种重新启动方式?
what are the restarting methods after dual engine failure?

A. APU引气重启 APU bleed relight

B. 风转启动 Wind-milling relight

C. 以上全部above all

判断正误True or False: 当探测到可能造成相撞的地形或障碍物时，将在MFD上自动弹出地形显示，且显示范围重置在20海里。When conflicting terrain or an obstacle is detected, the terrain overlay automatically pops up on the MFD and the display range is reset to 20 miles.

航空承运人在配备两名驾驶员的基础上增加一名第二机长时，如果机上没有经批准的机组睡眠区，并且所实施的飞行没有经停，则排班时计划的飞行时间最多为：

A. 10 小时

B. 12 小时

C. 14 小时

（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?

运行规范中批准实施的某种运行中断运行达____连续日历日，合格证持有人必须在继续实施此种运行之前通知民航当局并准备接受检查？

A. 30 个

B. 60 个

C. 20 个