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. 如果在初始印刷版之后必须添加一页，则给添加的页面使用带字母后缀的前一页页码(例如，第1-6A页、1-6B页等)。
B. 如果在最终印刷版之后必须添加一页，则给添加的页面使用带字母前缀的后一页页码(例如，第1-6A页、1-6B页等)。
C. 如果在初始印刷版之后必须删除一页，则给删除的页面装进信件并使用带前缀的前一页页码(例如，第1-6A页、1-6B页等)。
A. 把螺帽拧松一圈。
B. 拧紧螺帽半圈。
C. 拧紧螺帽一圈。
A. 放目录页的桌子必须标识日期但是无需编号。
B. 目录页必须写日期但是不用写数量。
C. 目录页必须注明日期，但无需编号。
A. Troubleshooting can only be performed after the cause of the malfunction has been found out.
B. You should perform troubleshooting according to the procedure and find out the technical failure.
C. According to the procedure, perform the troubleshooting to solve the cause of the malfunction.
A. Smooth the cargo-compartment door levers.
B. Polish the cargo-compartment door wheels.
C. Lubricate the cargo-compartment door handles.
A. 它应是独立的，并可重复其他测试。
B. 它应该被包含在内且能够复制其他的检测信息。
C. 它应该是自包含的，且能应用于其他检测。
A. 首先尝试安装有最短的螺纹区域的转接头。
B. 首先尝试安装带有最短螺纹的芯轴。
C. 首先尝试在最窄的区域内安装接头。
A. The system part is used to support the head of the aircraft when the aircraft is on the ground.
B. The part of the system is to keep the aircraft nose on the ground.
C. That portion of the system supports the nose of the aircraft while the aircraft is on the ground.
A. This procedure gives you the disassembly process.
B. You can find the procedures for disassembling in this section.
C. The assembly process can be found in this section.
A. Drill the hole until it has a radius of 8.00 +/- 0.003 mm.
B. Ream the hole until it has a diameter of 8.00 +/- 0.003 mm.
C. Trim the hole until it has a width of 8.00 +/- 0.003 mm.
