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ヤマトスチールの形鋼JIS G 3192 JIS G 3136 JIS G 3192 JIS G 3136 ※5 ※5 ※5 - 7 - 有効断面のとり方 Y XX r bb 幅厚比のとり方 フランジB/2t2 ウェブ(H-2t2)/t1
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