SANS 50219-1
SANS 50219-1 (Cold formed welded structural hollow sections of non-alloy and fine grain steels Part 1: Technical delivery conditions)· SANS (南アフリカ) · 40 材料
SANS 50219-1 (Cold formed welded structural hollow sections of non-alloy and fine grain steels Part 1: Technical delivery conditions)· SANS (南アフリカ) · 40 材料