title: angular 2 - how to set <select> default selected option
body: <p>My template is like this</p>
  
  <pre><code>&lt;select&gt;
    &lt;option&gt;AM&lt;/option&gt;
    &lt;option&gt;PM&lt;/option&gt;
  &lt;/select&gt;
  </code></pre>
  
  <p>How can I set option AM selected by default?</p>