Closed-loop double pipe direct return system  闭式双管异程系统

direct feeding system  直接供电方式

direct return system  异程式系统

direct return system DRS  异程系统

direct-feeding system  直供供电方式

two pipe direct return system  双管直接回水供暖系统

digital wire feeding system  数字化送丝机

Wire feeding system  送丝系统

wire-feeding system  送丝系统

AC three phase four wire system with neutral earthed  中性点接地的交流三相四线系统

AC three phase three wire system with earthed hull as neutral wire  利用船体作为中性线回路的交流三相三线系统

alternating current three phase four wire system with neutral earthed  中性点接地的交流三相四线系统

alternating current three phase three wire system with earthed hull as neutral wire  利用船体作为中性线回路的交流三相三线系统

dust density region return system with primary wind  密相返料

AC electrification railway with direct power supply system  直供方式交流电气化铁道

activating tungsten inert-gas welding with direct current straight polarity mode  直流正接A-TIG焊

copper loss with direct current  直镰损

direct current two- wire system  直流二线式

direct feeding  直接入料; 直接供电