在 500 百帕等压面上的低压中，空气质点所受的水平力有

马赫配平在什么情况下是可用的Mach trim is available when:

当可操纵副翼一侧的飞行员选择亮着的ROLL SEL 电门时，会发生什么？What happens when the pilot with the operable aileron selects the illuminated ROLL SEL switchlight?

升降舵系统卡阻记忆项目的第一个动作是？What is the first action of memory items for elevator system jammed?

什么操纵是被用于隔离升降舵钢索卡阻？What control(s) are used to isolate an elevator cable jam?

选择由电作动的2个飞行操纵Select two flight controls that are electrically actuated.

当襟翼/缝翼手柄设置在1时：When the FLAP/SLAT lever is set to 1:

襟翼45的Vfe是：Vfe for flaps 45 is:

襟翼30的Vfe是：Vfe for flaps 30 is:

飞机的总长度是多少 (CRJ 900)？What is the overall length of the aircraft (CRJ 900)?

CRJ900 系列飞机上有_个紧急出口.there are _emergency exits on the CRJ900 series aircraft .