在飞行中，使发动机以最低速度运转所需的功率，以确保满意的发动机运行和飞机操纵特性。
A The power required to run an engine, in flight, at the lowest speed that will ensure satisfactory engine operation and airplane handling system.
B The power required to run an engine, in flight, at the lowest speed that will ensure satisfactory engine operation and airplane handling characteristics.
C The power required to run an engine, in flight, at the lowest speed that will ensure correct engine operation and airplane handling characteristics.