如果A于4月10日将电子元件送到B处，那么合同于（ ）成立。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='31827' and id < 2544040 and id<>'2544040' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='31827' and id > 2544040 and id<>'2544040' order by id asc limit 5