相关题目
（ ） represents the relationship between the length and width of a wing. It is one of the primary factors in determining lift/drag characteristics.
The span of the wing refers to the （ ） ．
Aspect ratio is the span of the wing, wingtip to wingtip, divided by the （ ） ．
The purpose for rotating the nose gear is to （ ） .
Angle of attack is defined as the angle between the chord line of an airfoil and the （ ）．
Relative wind is the direction of the airflow with respect to the wing. It is parallel to and opposite to the （ ） ．
（ ） is an imaginary straight line drawn through an airfoil from the leading edge to the trailing edge.
Under most flying conditions, the impact pressure and the （ ） of air from the lower surface of the wing provide less than 25 percent of the total lift.
The function of lifting device is to （ ） .
During flight, pressures on the upper and lower surfaces of the wing are different mainly because of the （ ） ．
