css – 如何修复表单控件的宽度？

<div class="col-sm-12">
  <div ng-repeat="param in plugin.wsdlURLs track by $index" class="col-sm-12">
    <select class="form-control col-sm-4" ng-model="test" ng-options="lOrU for lOrU in localOrUrl">
    </select>
    <input type="url" class="form-control col-sm-8 invalidInput">
  </div>
</div>

我遇到了一个问题,当我放置一个表单控件类时,它将显示一行中的select和另一行中的输入.
我想保留表单控件类,并在同一行显示选择和输入.
我知道问题来自表单控件,因为宽度是100％

<div ng-repeat="param in plugin.wsdlURLs track by $index" class="row">
        <div class="col-sm-4">
            <select class="form-control" ng-model="test" ng-options="lOrU for lOrU in localOrUrl">
            </select>
        </div>
        <div class="col-sm-8">
        <input type="url" class="form-control col-sm-8 invalidInput">
        </div>
    </div>