carrier relay protecting device
directional comparison carrier relay
phase comparison carrier relay
carrier or pilot-wire receiver relay
carrier pilot relay system
carrier-actuated relay
载波激励继电器
载频起动继电器
载波致动继电器
载波驱动r继电器
carrier carrier interaction
carrier recovery， carrier reinsertion
FR-FR Frame Relay – to – Frame Relay
phase-rotation relay phase-sequence relay
phase-sequence relay phase-rotation relay
slow-release relay (=slow-releasing relay)
~(125)I seed carrier sheet
125I seed carrier sheet
150000DWT suez crude oil carrier
1550 nm light transmission of sub-carrier modulate trunk