直流电通过NaCl溶液时阴极下产生（ ）

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SQL Error: select id,body,options from ***_enewstiku where sourceid='25671' and id < 2157604 and id<>'2157604' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25671' and id > 2157604 and id<>'2157604' order by id asc limit 5