<div class="container marketing">
<!-- Three columns of text below the carousel -->
<div class="row">
<div class="span4">
<img class="img-circle" img
src="../assets/img/examples/GPP-final-app-logo.png">
<h2>Heading</h2>
<p>Donec sed odio dui. Etiam porta sem malesuada magna mollis euismod.
Nullam id dolor id nibh ultricies vehicula ut id elit. Morbi leo
risus, porta ac consectetur ac, vestibulum at eros. Praesent commodo
cursus magna, vel scelerisque nisl consectetur et.</p>
<p><a class="btn" href="#">View details »</a></p>
</div><!-- /.span4 -->
一切似乎都是正确的,但图像没有出现......我错过了什么?