双流发电机double-current generator
【电】 双流发电机double-current generator
双流式继电器double-current relay
双流制单工电路double-current simplex circuit【通信】
双流电键double-current key
双流电键double-current key【通信】
双流传输double-current transmission【通信】
双流传信double-current signalling【通信】