The speed of aeroplaneengine is variational, so the electricity energy that the aeroplane generator gives off is variational frequency communion electric current.
飞机发动机转速是变化的，因此由飞机发电机发出的电能是变频交流电。
2
They calculate from the given factors such as weight, height, speed, engine power-the efficiency of a new aeroplane.
他们可以通过所给出的因素计算出一架新飞机的效能，这些因素包括飞机的重量，高度，速度和引擎功率。
3
Today our programme is about the first aeroplane with an engine.