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一根直棒,怎么彎成這個形狀?批量生產(chǎn) |
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點評
你標(biāo)題誤導(dǎo)別人了,都以為是實心棒料呢。
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點評
剛才說錯了。鋁的比重是2.9。鐵7.85.不銹鋼7.93。銅8.8。呵呵帶來不便請諒解?。。。。。?!
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