2.An on-off switch with pilot light, reversing switch and a power rheostat are mounted on the base.
开关还附有指示灯,转换装置及电阻在底座上。
4.Some switches also contain a rheostat to control the brightness of the instrument panel lights.
一些开关也包含一个可变电阻器,控制仪表板灯的灯光亮度。