全钢组成，机械强度高、承载能力强、防火性能好。

Constituted by all steel sheet, high mechanic strength and loading capacity, excellent fire-proof.

youdao

全钢组成，机械强度高、承载能力强、防火性能好。

Constituted by all steel sheet, high mechanic strength and loading capacity, excellent fire-proof.

youdao