【电学】直流电信技术，变动补偿机制

direct-current meter transformer

speed conversion dc telegraphy (direct-current telegraphy)

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】

direct voltage【电】;direct-current voltage【电】