电脑为什么到固定时间就自动锁屏?

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select * from tbl_Articles WHERE ArticleID=640597 LIMIT 0,1
select * from tbl_Articles_data WHERE ArticleID=640597 LIMIT 0,1
select * from tbl_Articles_sphinx where id=640597 LIMIT 0,1
SELECT ArticleID,Title FROM tbl_Articles WHERE ArticleID IN(414458,1100992,903203,1070111,673334,809481,1130772,1127064,1132131,1009669,3054772,466953,1127209,840749,3043074,1096312,500316,773415,1186252,3086591,1097728,1081678,1113664,1463319,747521,897245,1132219,1298500,1127449,1126604) ORDER BY field (ArticleID,414458,1100992,903203,1070111,673334,809481,1130772,1127064,1132131,1009669,3054772,466953,1127209,840749,3043074,1096312,500316,773415,1186252,3086591,1097728,1081678,1113664,1463319,747521,897245,1132219,1298500,1127449,1126604)