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query help

well guys i have a doubt about how to query parameters fields, those fields that we select they parameters value. i want a field that is a parameter search type, but i don't know who return his value on my visualForce page i've did it a select to see if my query is right and only return my field id.

someone could give me a example how to do those queies? 



apex code

public Account getAcc(){
Account a = [Select Id, Name, CustomField__c from Account LIMIT 1];
return a;

visualforce code

<apex:outputfield value="{!Acc.Name}"/>
<apex:outputfield value="{!Acc.CustomField__c}"/>