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XX龙净环保科技XX原材料标准偏差ZJ802-16(3)-板类 GB/T709-2006板厚允许偏差板类GB/T709-2006板厚允许偏差t2±0.21t3±0.45t5±0.45t6±0.50t

腾讯文库原材料标准偏差汇总原材料标准偏差汇总