作为标准配置，上部结构材质是碳钢。

The superstructure is carbon steel as standard.

youdao

六角网是由优质低碳钢丝制成，此网结构坚固，表面平坦。

Hexagonal wire mesh is made of low carbon steel wire, solid structure, and smooth surface.

youdao

六角网是由优质低碳钢丝制成，此网结构坚固，表面平坦。

Hexagonal wire mesh is made of low carbon steel wire, solid structure, and smooth surface.

youdao