As i know we can set the radio button as default buttion by using the code (checked) . how about the select button? Can i do the same thing to select button? Thanks!

You can use 'selected' for that.
Check below code you will understand.

<select name="selectbox">
<option value="">- - Select - -</option>
<option value="Computer">Computer</option>
<option value="Hello" selected="selected">Hello</option>
<option value="World">World</option>
</select>
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