某足够大的容器中有浓度为10%的糖水2 000克，若要得到浓度为30%的糖水，则还需向上述容器中加人浓度为40%的糖水（ )。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31289' and id < 2511576 and id<>'2511576' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31289' and id > 2511576 and id<>'2511576' order by id asc limit 5