adjustable pitch airscrew的用法和样例：
- Provided with high performing adjustable pitch aerofoil impellers in PAG, aluminum, steel and stainless steel.
- Design and make a wind turbine which can adjust pitch angle of oar leaves through various of wind speed, and make experiment of characteristic.
- Variable Vector Propeller (VVP) is a new type thruster, which can be used to provide forces in any directions by adjusting pitch angle periodically.
- She has keyed the piano up to concert pitch.