seamlessadj.持续的；无缝的seamless shell crown无缝壳冠seamless rolled tube无缝轧制钢管seamless embeddement无缝隙嵌入SeamlessGas Cylinder大容积钢制无缝气瓶seamless rib machine无缝罗纹圆袜机seamless supervision无缝隙监管seamless copper tube无缝紫铜管seamless steel elbow无缝弯管seamless copper pipe无缝铜管seamless copper band无缝铜带环