1キログラムのPVC溶接棒で、何メートル分の溶接ができるか
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1キログラムのPVC溶接棒で、何メートルの溶接部を作ることができるか。。提出すべき資料には、類似の経験がありません。。。
これは溶接断面積と関係があるはずです。
断面積が違えば、当然長さも違います
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