automatic exchange,automatic telephone switchboard,dial exchange
相关英语词汇推荐
- value control amplifier
- leading-out
- Warp Beam
- hard drawn copper wire
- vacuum lock
- Quadrature components
- adjustment of itself
- oil heater storage tank
- relay satellite
- bog
- normal condition
- steam circulating pipe
- intermediate-base resin
- pending the issuance of licence
- maximum permissible pressure
- effective projected radiant surface
- gravity meter
- inhibitory action
- autosynchronous
- pneumatic remote control