variable vane可调导向叶片variableadj.可变的；易变的n.变量；易变的东西variable-length segment变长字段variable frcquency method变频法Variable-density method变密度法variable speed gear motor变速式电动机variable bit rate service可变比特率业务variable choke carburetor见constant depression carburetorvariable velocity mapping变速成图variable fuzzy clustering可变模糊聚类variable structure system变结构系统variable weight appraisal变权评价