如何用一个圆规画线段中点

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select * from tbl_Articles WHERE ArticleID=259377 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=259377 LIMIT 0,1
select * from tbl_Articles_sphinx where id=259377 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(1541835,854454,1275366,686646,1761344,1524877,197883,1410125,1415890,156731,1758813,1533179,329410,1542813,1760255,1589791,1113654,1286823,219481,1299291,1722678,1452742,331169,1998544,1727621,913683,1747407,1714355,1791125,135982) ORDER BY field (ArticleID,1541835,854454,1275366,686646,1761344,1524877,197883,1410125,1415890,156731,1758813,1533179,329410,1542813,1760255,1589791,1113654,1286823,219481,1299291,1722678,1452742,331169,1998544,1727621,913683,1747407,1714355,1791125,135982)