main cock的用法和樣例：
例句
- The rheostat is operated by rotating the control knob, separating it from the push-pull action of the main lighting switch.
可變電阻器由旋轉的控制手柄操縱，與燈光總開關的推一拉的操縱是分開的。
main cock的相關資料：
臨近單詞
maintop
main
main wheel differential brake
main transformer differential
Main stem and tiller dynamics
main forestry production area
Main Functional Zone Planning
main steam temperature system
main network switching center
main oil distributing passage
Main afforesting tree species
Main Features of Simple Types
