Report - 大陸GB-T 20428-2006花崗石平台標準 · 2018. 12. 2. · GB/T 20428— 5 mm 1/20 500 kg • 2006 f) 320 390 490 500 500 500 500 340 420 / mm 400 X 250 630 x 400 1 ooox 630 115

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