Is the first @import an absolute url and the other two realtive urls?

@import url(http://example.org/library/layout.css);
@import url(basic-text.css);
@import url(printer.css) print;
body {color: red;}
h1 {color: blue;}

Yes, thats right.
The “relative” means that the path is related to the file which has the @import.
In the 2nd and 3th lines, the .css files should be in the same folder as to one using the @import.

Thank you very much!