C#使用NPOI创建Word表格插入图片时,如何固定列宽?

我先是创建了表格,设置第五行列宽对半分;
然后将图片添加到对应单元格后,单元格变形了;
该怎么让其不变形呢?

     XWPFTable table = doc.CreateTable(5, 4);
     table.Width = 5000;
     //设置行高列宽
     table.Rows[4].Height = 3000;
     CT_TcPr m_Pr = table.GetRow(4).GetCell(0).GetCTTc().AddNewTcPr();
     m_Pr.tcW = new CT_TblWidth() { w = "2500", type = ST_TblWidth.dxa };
    ...
    //插入图片
     ctp = table.Rows[4].GetCell(0).GetCTTc().GetPList()[0];
     XWPFRun run = table.GetRow(4).GetCell(0).GetParagraph(ctp).CreateRun();
    table.GetRow(4).GetCell(0).GetParagraph(ctp).Alignment = ParagraphAlignment.CENTER;
    var img = new FileStream(tpmc1, FileMode.Open, FileAccess.Read);
    run.AddPicture(img, (int)PictureType.JPEG, tplj1[0]["name"], widthPic, heightPic);
    img.Close();

图片说明

https://zhidao.baidu.com/question/204835106770909005.html