variable bias可变偏压variableadj.可变的；易变的n.变量；易变的东西variable number of tandem repeat不定数串列重复区variable expansion eccentric cam可变膨胀偏心凸轮variable frequency fuzzy control变频模糊控制variable format part description可变格式部分描述variable threshold logic circuit可变阈值逻辑电路variable density thin light pipe可变密度薄光导variable fuel orifice carburetor可变燃料口式汽化器variable scale fractal technique变尺度分形技术variable-speed DC drive system直流谪速装置variable frequency power sources变频电源