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hongbaoshuISO 834-6: 2000, MOD) 1 (GB/T 9978.1—2008, ISO 6 (GB/T 9978.6—2008, GB/T 5907 GB/T 9978.1 3.1 beams 3.2 exposed length exposed width 3.4 floor 1) GB/T 5907—1986. GB/T
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