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Cad é caighdeánú do tháirgí?

2022-06-27

C: Cad é caighdeánú do tháirgí?


A: GB/T 700-2006 Cruach struchtúrach carbóin, 45# i GB/T 699 Q235, 195, 215, 255, 275 i GB/T700.


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