variable pole变磁极性variableadj.可变的；易变的n.变量；易变的东西variable elevation beam-antenna可变仰角射束天线variable-area propelling nozzle可变截面推力喷管variable induction magnetic field可变感应磁场variable frequency vibration test变频振动试验variable geometry truss mechanism变几何桁架机构variable feqency speed regulation变频调速variable-length instruction set变长指令系统variable diode function generator可变二极管函数发生器variable-length records sorting变长记录排序variable dilution sampling system可变稀释取样系统