.u=-100sin(6πt+10°)超 前 u'=5cos(6πt-15)A  相 位 差 是(     )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69437' and id < 4496815 and id<>'4496815' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69437' and id > 4496815 and id<>'4496815' order by id asc limit 5