differential via差分过孔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 doppler frequency shift差动多普勒频移differential case oil collector drum分速器箱集油鼓differential loudness summation testDLS试验, 响度辨差总和试验differential potentiometrictitration差示电位滴定differential equation of two-order二阶微分方程differential gear for screw conveyer螺旋输送机的差动装置differential drive assisted steering差动助力转向differential computing potentiometer微分计算电位器differential settlemtn of foundation基础沉降差differential equation with one delay单时滞微分方程