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[國家標準] GB 9711.1-1999 石油天然氣工業(yè)輸送鋼管 交貨技術(shù)條件 |
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|關(guān)于我們|網(wǎng)站地圖|油氣儲運網(wǎng) ( 魯ICP備11007657號-3 )
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