A、 Crucial angle of attack is the angle at which a stream or air flow begins to split from a surface,causing a decrease in efficiency. It is important for designing dynamic surfaces ,such as airplane wings,turbine blades,as it determines the maximum attack angle that can be achieved without causing loss of lift or thrust.
B、 Crutial angle of attack is the angle at which a stream or air flow begins to seperate from a surface,causing a decrease in efficiency. It is important for designing aerodynamic surfaces ,such as airplane airfoils,turbine blades,as it determines the maximum attack angle that can be achieved without causing loss of lift or thrust.
C、 Critical angle of attack is the angle at which a fluid or air flow begins to separate from a surface, causing a reduction in the efficiency of the flow. The critical attack angle is an important consideration in the design of aerodynamic surfaces, such as airplane wings, turbine blades, as it determines the maximum angle of attack that can be achieved without causing a loss of lift or propulsion.
答案：C
A、 Crucial angle of attack is the angle at which a stream or air flow begins to split from a surface,causing a decrease in efficiency. It is important for designing dynamic surfaces ,such as airplane wings,turbine blades,as it determines the maximum attack angle that can be achieved without causing loss of lift or thrust.
B、 Crutial angle of attack is the angle at which a stream or air flow begins to seperate from a surface,causing a decrease in efficiency. It is important for designing aerodynamic surfaces ,such as airplane airfoils,turbine blades,as it determines the maximum attack angle that can be achieved without causing loss of lift or thrust.
C、 Critical angle of attack is the angle at which a fluid or air flow begins to separate from a surface, causing a reduction in the efficiency of the flow. The critical attack angle is an important consideration in the design of aerodynamic surfaces, such as airplane wings, turbine blades, as it determines the maximum angle of attack that can be achieved without causing a loss of lift or propulsion.
答案：C
A. Your skin and lungs can be protected.
B. Your skin and lungs can be harmed.
C. Your skin and lungs can be harmed suddenly.
A. 拧紧堵头至6牛顿。
B. 给堵头磅力矩至6牛米。
C. 测量堵头拧紧力为6牛顿米。
A. This program describes how to identify an immediate failure and how to handle a malfunction occurred.
B. This procedure explains how to recognize impending problems and what to do if malfunctions occur.
C. How to confirm the current problems and what should you do when malfunctions occur are described in this procedure.
A. 数据应显示外界温度、高度和风与起飞距离的关系。应包括地面滑跑距离和飞机达到高于地面50英尺的总起飞距离。达到这些距离所需的速度需应以指示空速给出。
B. 数据应显示为距离与外界大气温度、高度和风的关系。应包括地面滑跑和超过50英尺障碍物的总距离。达到这些距离所需的速度应在指示空速中规定。
C. 数据应以起飞距离与外界空气温度、高度和风力的关系来表示。地面横滚和50英尺障碍物的总距离都应包括在内。达到这些距离所需的速度应以指示空速进行计算。
A. Altitude meter shows the aircraft altitude relative to the horizon.
B. Attitude meter shows the aircraft attitude relative to the horizon.
C. Altitude meter shows the aircraft altitude relative to the level.
A. Evaluate the impedance between the antenna baseplate and the airplane skin.
B. Record the measured resistance between the antenna baseplate and the airplane skin.
C. Perform the measurement of the resistance between the antenna baseplate and the airplane skin.
A. 用黑色字体在页面外侧对改版、补充和删除进行说明，对应于已经更改的部分打印内容。
B. 应在书页外侧以垂直黑线标记修订、增加和删除之处，仅对应于印刷件中已更改的内容。
C. 对于经过修订和增删的文字，沿书页外侧用粗黑直线加以标识，并仅打印修改内容部分。
A. In the turbofan engine maintenance handbook this chapter would include such subjects as removal, cleaning, inspection, disassembly, testing , etc.
B. In the turbofan engine repair manual this section would include such topics as disassembly, cleaning, checking, accessory, adjusting , etc.
C. In the turbofan engine overhaul manual this section would include such subjects as teardown, cleaning, inspection, assembly, testing , etc.
A. 它们适用于位于05-20划分中那些案例，其中第四个数不能涵盖上面05-10子系统中致力的所有维修检查。
B. 它们是为05-20划分中的第4位数字所提供的划分数不足以覆盖上述子系统05-10所规定的所有维修检查的那些情况保留使用的。
C. 他们被预留给那些05-20第四级划分号的论据，这个划分不足以覆盖05-10子系统上方说明的所有维修检查。
A. 对于着陆距离，应包括地面滑跑和超过50英尺障碍物的总距离。
B. 对于着陆距离，应包括地面滑跑距离和从高于着陆表面 50 英尺到着陆完全停止飞越的地面距离。
C. 对于着陆距离，应包括地面滚转和超过50英尺障碍物的总距离。
