SEAMLESS TUBE11/2"是什么意思?

seamless network seamless union是什么意思呀seamless是什么意思 seamless jointing是什么意思 seamless cloning是什么意思,能不能给科学解释下? seamless machine 1)Stainless Steel Seamless Pipe ASTM A312 316L Sch-10 Size:2 不锈钢知识求解!seamless tubing inox 1/2 'OD*0.049' wall thickness * Seamless steel pipes,Material A333GR1,BE,SIZE :1/2 " SHC.80 the original multifunctional seamless Love not Providence seamless 16" cs seamless pipe,api 5l gr.b.psl-2,sch.40,be,drl,nace mr CS Seamless pipe API 5L Gr.B.PSL-2,Sch.40,BE,DRL该如何解释? bearing grade seamless steel tubes是什么管