Css Link Style about the standards.

[guangdian 0]

<link rel="stylesheet" href="html/style.css" type="text/css"><link rel="stylesheet" href="html/another.css" type="text/css">

with

<style type="text/css"><!--@import url("templates/xhtml/calendar.css");@import url("templates/xhtml/style.css");--></style>

why " import " it?

which better? why?

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when i use import method.
there always display the webpage first but then css.
when i changed link method.
there is okay.