永杰新材:永杰新材重大资产购买报告书(草案)与预案差异情况对照表公告日期:2026/04/20 · 栏目:其他公告链接:http://static.sse.com.cn/disclosure/listedinfo/announcement/c/new/2026-04-20/603271_20260420_FQ5V.pdf