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Q235B的材料是碳鋼嗎? |
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點(diǎn)評(píng)
Q235(A、B、C、D)稱為碳素結(jié)構(gòu)鋼,而45成為優(yōu)質(zhì)碳素結(jié)構(gòu)鋼。這就是不一樣
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