铜中心经理杨锁洪先生（左一）、副处长顾良民先生（右一）出席美国ISRI协会1998年会，并应邀发表演讲。

Mr. Yang Suohong (first left), Manager of Copper Division and Mr. Gu Liangmin (first right), Deputy Manager of Copper Division, presented ISRI 1998 Convention with an address.