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. At the manufacturer's option,static pressure systems description and discussion may be combined with Paragraph 7.49,Pitot Pressure Systems.
B. The manufacturer could combine the description and discussion of the dynamic pressure systems in Paragraph 7.49,Pitot Pressure Systems.
C. The manufacturer decides to insert static pressure systems description and discussion into Paragraph 7.49,Pitot Pressure Systems.
A. That section of the systems which controls the position and rotation of the trailing edge flaps.
B. That portion of the systems which controls the position and movement of the trailing edge flaps.
C. That part of the systems which controls the position and rotation of the flaps.
A. This document verifies the various torque values and the conditions where they are applicable.
B. This document verifies the various torque values and the conditions where they are null.
C. This document specifies the various torque values and the conditions where they are applicable.
A. 一个关于序列号/组件号(或其他识别信息)的列表在右边页面相应的栏目中。
B. 页面右侧相应的栏目中列出了对应的序列号/组件号(或其他识别信息)。
C. 一组对应序列号/组件号(或其他识别信息)的栏目应显示在正确的页面上。
A. “机载辅助动力”是指安装在飞机上的机载动力装置(发动机),其目的是用于产生和提供单一类型的辅助电力、气压、气动或其他动力。
B. “机载辅助动力”是指安装在飞机上的机载动力装置(发动机),用于产生和提供单一类型的辅助电源、液压或气源动力等或者组合型动力。
C. “机载辅助动力”是指安装在飞机上的机载动力装置(发动机),其目的是用于产生和提供组合型的辅助电力、液压、电动或其他动力。
D. C.“机载辅助动力”是指安装在飞机上的机载动力装置(发动机),其目的是用于产生和提供组合型的辅助电力、液压、电动或其他动力。
A. Schematic diagram designers may make a compromise so as to add more details to make the diagram self-explanatory and keep its simplicity at the same time for ease of reading and understanding.
B. In designing schematic diagrams,it may be necessary to pay attention to both detail that is necessary to make the diagram self-explanatory,and simplicity that is essential for ease of reading and understanding.
C. Detail makes the diagram self-explanatory.Simplicity makes it easy to read and understand.It is necessary to consider both of them and make a compromise if needed when designing schematic diagrams.
A. Information on specific optional systems or equipment may be included in this section or in Section 9,Supplementary.
B. Information about noncompulsory systems or equipment may be included in this section or in Section 9,Supplements.
C. Information on specific optional systems or equipment may be included in this Section or in Section 9,Supplements.
A. 反推可以提供刹车力使尾喷气流偏转至相反方向。
B. 反推通过使排气气流转向相反的方向来产生制动力。
C. 尾气气流偏离至反方向从而使反推提供刹车。
A. Make sure that chemical compound are not near the engine nozzle.
B. Make sure that solvents are not near the engine exhaust.
C. Make sure that there's no isopropyl alcohol near the engine exhaust port.
A. 如果警告灯是亮的,将无法在门关闭时正确调节微电门。
B. 在门关闭时如果警告灯亮起,说明微电门调节不正确。
C. 在门关闭时如果标志灯在位,微电门将无法正常调节。
