なぜ同じボルトの材質とサイズでも、等級が異なるのでしょうか？
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なぜ同じボルトの材質とサイズでも、等級が異なるのでしょうか？違いはどこにあるのでしょうか？
製造要件が異なり、検査基準も異なり、例えばドイツ規格と中国規格がある。
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