You don't say 'transistor' when you can use 'controllable electronic valve' -that sort of thing.
比如说，如果能用‘可控电子管’这种说法，就不要用‘晶体管’。
2
The dissertation studies the problems of the voltage regulation and arc—extinguishing of magnetic valvecontrollable reactor both in theory and application.
论文从理论和应用两个方面研究了磁阀式可控电抗器在电力系统中的调压和消弧问题。
3
Introduced the basic structure and working principle of the magnetic valvecontrollable reactor.