magnetic differential flow recorder 磁性压差流量记录仪

pressure differential flow meter 差压流量计

high differential flow 高流量差

Constant Differential Flow Controllers 常数差流量控制器

differential flow controller 差示流量控制器

differential flow indicator 差流量指示器

threshold differential pressure of flow 门限流动压差 ; 门限活动压差

big differential flow 大差动出流

differential flow rate 差分流量