variable pole变磁极性variableadj.可变的；易变的n.变量；易变的东西variable-resistance transducer变阻传感器variable stiffness spiral spring变刚度螺旋弹簧variable pitch speed change gear可变齿高变速齿轮variable pitch propeller logbook变距螺旋桨记录簿Variable Range Ballistic Missile可变射程弹道导弹Variable Structure Sliding Model滑模变结构variable ratio frequency changer可变频率比变频器variable baseline interferometer变基线干涉仪variable-resistance microphone可变电阻传声器variable-section surge chamber变断面调压室