2018| 14
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求碳鋼圓柱管,方管,尺寸和壁厚表 |
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點(diǎn)評(píng)
不然有些規(guī)格尺寸不一定容易買(mǎi)到
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點(diǎn)評(píng)
不是收費(fèi)了嗎
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點(diǎn)評(píng)
這個(gè)管徑為啥是直徑30起步的
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