6931| 18
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工作用錯(cuò)材料,,把二個(gè)不同的材料混一起了,如何區(qū)分中碳和低碳鋼? |
點(diǎn)評(píng)
對(duì),,教材就這么說,,焊工那篇
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點(diǎn)評(píng)
正解。
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