广大特材：关于公司核心技术人员离职的公告

Group 1 - The core viewpoint of the article is that Mr. Ren Zheng, a key technical personnel of the company, has resigned from his position due to personal reasons and has completed the necessary procedures for leaving the company [2] - Following his departure, Mr. Ren Zheng will no longer hold any position within the company [2]