如果脉冲重复频率为2000Hz，则Nyquist频 率极限为（     ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25726' and id < 2162897 and id<>'2162897' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25726' and id > 2162897 and id<>'2162897' order by id asc limit 5