Lead as impurity in rig ( rare earth iron garnet ) faraday rotators used for fibre optic communications systems 于光纤通讯系统稀土铁石榴石法拉第旋转器中作为杂质的铅。
2.
Light sources adopt halogen bulbs as four rotators and four flashing bulbs which distributing symmetrically 光源全部采用优质卤素灯泡， 2只闪灯（交叉闪烁） ， 4只转灯， 2只射灯，左右对称分布。
