可调螺距 meaning in English

adjustable pitch
controllable pitch

Technical requirements for marine controllable pitch propellers
船用可调螺距螺旋浆技术条件
Design method for controllable pitch propellers by employing methodical series test diagrams
可调螺距螺旋桨桨叶图谱设计计算方法
Diagnoses for the three gorges shiplift hauling control system intelligence based classification hierarchy diagnosis model
基于模糊智能控制的船用可调螺距桨系统仿真研究