As an emphasis, the fusion zone is always studied by the welding engineers for a long time.

长期以来，异种钢接头熔合区一直是焊接工作者研究的重点。

youdao

As an emphasis, the fusion zone is always studied by the welding engineers for a long time.

长期以来，异种钢接头熔合区一直是焊接工作者研究的重点。

youdao