arccos0.2等于多少度啊

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select * from tbl_Articles WHERE ArticleID=1708666 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=1708666 LIMIT 0,1
select * from tbl_Articles_sphinx where id=1708666 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(207841,1810767,2658544,1429708,1079027,192160,254787,1092365,247249,253572,1124917,168782,175008,258333,194537,128955,202824,144415,3286475,323729,1132477,1304141,1368052,1973636,1709925,140047,265582,207361,132851,154449) ORDER BY field (ArticleID,207841,1810767,2658544,1429708,1079027,192160,254787,1092365,247249,253572,1124917,168782,175008,258333,194537,128955,202824,144415,3286475,323729,1132477,1304141,1368052,1973636,1709925,140047,265582,207361,132851,154449)