航空燃气涡轮发动机内（）气体压力最高。

The ability of the airplane to fly slowly is especially important during the （ ） ．

When properly used, flaps （ ） ．

The airspeed required to sustain an aircraft in straight and level flight depends on （ ） ．

Lift is proportional to the square of the airplane’s velocity. If an airplane’s speed is reduced by one half, lift （ ） ．

Lift is proportional to the square of the airplane’s velocity. If an airplane’s speed is doubled, lift increases （ ） ．

The indicated airspeed of a stall varies with （ ） ．

An airplane stalls when （ ） , regardless of weight or airspeed.

The way to recover from a stall is to （ ） ．

The occurrence of a stall is directly related to （ ） ．

A stall will normally result in a rapid decrease in （ ） ．