?!DOCTYPE html>
来源Q?a href='http://www.homeservertips.com/news/154.html'>http://www.homeservertips.com/news/154.html ?发表旉Q?021-01-21
3、当原管径相差较大时Q由于选用较小径的衬,当原内径较大时Q衬不能与原管接近?/span>