variable bias可变偏压variableadj.可变的；易变的n.变量；易变的东西Variable Low Frequency Standard可变低频标准Variable-frequency technology变频技术variable directional microphone可变方向性传声器Variable Weight Adaptive Filter变权值自适应滤波variable structure guidance law变结构制导律variable division ratio divider可变分频器Variable helix angle bevel gear可控螺旋角锥齿轮variable length instruction set可变主时钟variable speed adjustable pitch变速变距variable-delivery rotary pump可变排量旋转泵