实验过程中长时间使用恒温水浴锅时，应注意及时加水，避免烧干。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30402' and id < 2457803 and id<>'2457803' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30402' and id > 2457803 and id<>'2457803' order by id asc limit 5