【单选题】装备汽化器的航空活塞发动机与装备燃油直接喷射装置的航空活塞发动机的燃油使用经济性相比:
A.更好
B.更差
C.一样
D.无法比较
A.更好
B.更差
C.一样
D.无法比较
【单选题】在高空飞行的飞机上,液压油箱必须增压,其目的是:
A.提高液压系统的压力
B.防止油箱中的液压油溢出
C.给液压泵进口提供正压,并防止系统气塞
D.给液压泵出口提供正压,并防止系统泄漏
A.提高液压系统的压力
B.防止油箱中的液压油溢出
C.给液压泵进口提供正压,并防止系统气塞
D.给液压泵出口提供正压,并防止系统泄漏
【单选题】飞机主飞行操纵系统在飞行中的功用是:
A.用来操纵副翼、方向舵和升降舵的运动.
B.操纵飞机绕纵轴、立轴和横轴转动,以改变或保持飞机的飞行姿态.
C.操纵飞机沿纵轴、立轴和横轴运动,以改变或保持飞机的飞行姿态.
D.操纵飞机起飞、着陆和上升、下降.
A.用来操纵副翼、方向舵和升降舵的运动.
B.操纵飞机绕纵轴、立轴和横轴转动,以改变或保持飞机的飞行姿态.
C.操纵飞机沿纵轴、立轴和横轴运动,以改变或保持飞机的飞行姿态.
D.操纵飞机起飞、着陆和上升、下降.
【单选题】近地警告系统主要采用的高度信息是:
A.气压高度
B.无线电高度
C.IRS提供的
D.ABC都可
A.气压高度
B.无线电高度
C.IRS提供的
D.ABC都可
【单选题】电波传播的速度v、频率f和波长λ之间的关系是:
A.v=λ/f
B.v=λf
C.v=f/λ
D.v=2λ/f
A.v=λ/f
B.v=λf
C.v=f/λ
D.v=2λ/f
【单选题】速度最大的垂直运动是:
A.对流
B.系统性升降运动
C.乱流
D.大气波动
A.对流
B.系统性升降运动
C.乱流
D.大气波动
【单选题】To identify an aircraft by turning before providing radar service, the turning angle should be greater than _______.
A.10°
B.20°
C.30°
D.40°
A.10°
B.20°
C.30°
D.40°
【单选题】The category symbol for flight forecast is _______.
A.PLN
B.COR
C.FPL
D.CRT
A.PLN
B.COR
C.FPL
D.CRT
【单选题】The amount of moisture the air can hold depends on air temperature _______ is the temperature at which air becomes saturate
D.
A.Dewpoint
B.Humidity
C.Moisture
D.Relative humidity
D.
A.Dewpoint
B.Humidity
C.Moisture
D.Relative humidity
【单选题】The most frequent type of ground or surface-based temperature inversion is that produced by _______ .
A.radiation on a clear, relatively still night
B.warm air being lifted rapidly aloft in the vicinity of mountainous terrain
C.the movement of colder air under warm air, or the movement of warm air over cold air
D.the widespread sinking of air within a thick layer aloft resulting in heating by compression
A.radiation on a clear, relatively still night
B.warm air being lifted rapidly aloft in the vicinity of mountainous terrain
C.the movement of colder air under warm air, or the movement of warm air over cold air
D.the widespread sinking of air within a thick layer aloft resulting in heating by compression
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