【电学】直流电信技术，手工（材料）.(旋转托盘)

direct-current meter transformer

speed conversion dc telegraphy (direct-current telegraphy)

direct-current telegraphy, compensating variations

direct-current system【电】;straight flow system【航】

direct-current

direct-current aoupling

direct-current signalling【通信】;direct-current signaling【电】

direct-current amplitude discriminator【通信】