一个机场的过渡高度应当尽量的低，但最低不能低于多少英尺？

正常情况下，在发动机关车前需要确认满足哪些条件?Normally, engine cannot be shut down beforeconfirming the following situations：

A. 反推手柄在收起位 Reverser levers are at stowed position;

B. N1表上的 REV（反推）字样消失 REV icons on the N1 gauge disappears

C. REV UNLOCKED（反推松锁）警戒信息消 失 REV UNLOCKED caution message goes out.

上座前检查，关于撤离出口检查说法错误的是（ ）
About checks prior to taking seat, which one is incorrect for checking the escape hatch?

A. 检查撤离出口关闭并锁定 Check the escape hatch is closed and locked

B. 应确保两个绿色目视标志正确校准 Ensure two green witness marks are correctly aligned

C. 应确保1个绿色目视标志正确校准 Ensure one green witness mark is correctly aligned

起飞着陆阶段，在遭遇微下击暴流的情况下，逆风突然减小将引起

A. 与风速减小量相等的空速损失

B. 等于风速减小量两倍的空速损失

C. 等于风速减小量两倍的空速突然增大

云能浮在天空主要是由于：

A. 云滴比空气轻

B. 上升气流的作用

C. 垂直气压梯度力的作用

D. 空中风的吹送

判断正误true or false:自动驾驶断开会导致马蹄声音响告警并且主飞行显示上的AP指示变为红色。Disengaging the autopilot causes a cavalry charge aural alert, and the AP indication on the Primary Flight Display (PFD) turns red.

判断正误true or false：自动飞行控制系统（AFCS）提供一个双轴、双通道、失效被动保护的自动驾驶（AP）。The Automatic Flight Control System (AFCS) provides a two axes, dual channel, fail-passive autopilot (AP)

下面关于风与气压场关系的叙述，正确的是

A. 高压区的风大于低压区的风

B. 等压线越密，风速越大

C. 在摩擦层中，风垂直穿过等压线

（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?

山岳波中最危险的乱流区出现在

A. 滚轴状云中和滚轴状云下

B. 滚轴状云中和滚轴状云上

C. 荚状云中和荚状云下

接近传感系统的作用是什么？What is the purpose of the proximity sensing system?

A. 控制起落架顺序和给各种飞机系统提供位置信息controls landing gear sequencing and provides position information to various aircraft system

B. 监控刹车压力和控制起落架顺序Monitors brake pressure and controls landing gear sequencing

C. 提供抬轮和起落架位置的指示Provides indications of wheel rotation and gear position

D. 监控放出或收回完成的比率和前轮舱门状态Monitors the percentage of extension or retraction completed and nosewheel door status