如果信号频率为50Hz，采用（ ）Hz采样频率才能满足采样定理要求。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29467' and id < 2399021 and id<>'2399021' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29467' and id > 2399021 and id<>'2399021' order by id asc limit 5