某微机保护的采样频率为4kHz,则信号调理部分抗混叠滤波器的截止频率至少 为(    )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69480' and id < 4501519 and id<>'4501519' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69480' and id > 4501519 and id<>'4501519' order by id asc limit 5