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45#鍛件的力學(xué)性能和45#鋼材的力學(xué)性能一樣嗎,? |
點(diǎn)評(píng)
大神,你是怎么區(qū)分輕載和重載的,?
評(píng)分
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點(diǎn)評(píng)
遺憾,,重要的資料要備份啊
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點(diǎn)評(píng)
這個(gè)比喻很形象
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