You can also go to an optical shop for such a service.
你亦可到眼镜店查询此项服务。
As carrier network, optical transport network must be built prior to the 3g service network.
作为业务承载网络的3g光传送网，必须要先于业务网络的建设而建设。
Offering field testing service of optical cable;
提供光纤光缆现场测试服务；
Offering field testing service of optical cable;
提供光纤光缆现场测试服务；
应用推荐