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。
I got to turn the main power switch back on. 我得去把主開關打開。
All rooms are linked to the main switchboard. 所有的房間都與主開關連接。
滬公網安備 31011502000490號
電信業務許可證編號：滬B2-20190700
