WHAT DOES YB:GLASS & ER MEAN?

Desk clerk Frank (Troy Evans) normally talks about everyday living over the "pressure" as being a Chicago police officer. In the main episode, he experienced an look to be a police officer, who was shot and dealt with by the ER workers.掺铒玻璃在红外范围内具有高放大效率，使其适用于长距离光纤通信。掺钕玻璃以其宽