differential arc差动电弧differentialadj.差别的；特定的；微分的n.差别；工资差额；差动齿轮；[数]微分differential dynamometer差动测力计,差动式功率计differential exponential微分指数differential-transistorn.差分晶体管differential automorphism微分自同构differentially expression差异表达differential magnetometer差动磁强计differential vacuum gauge差示真空规differential refracometer示差折光计differential limen method差别阈限法differential of a mapping映射的微分