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GB/T 1499.1-2017 Steel for the reinforcement of concrete-Part 1.Hot rolled plain bars GB/T 1499.1-2018 Steel for the reinforcement of concrete-Part 2.Hot rolled ribbed bars MNS ISO 6934-1:2003 "Бетоныг урьдчилан хүчитгэхэд зориулсан ган.1-р …