3112| 9
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鋼管的標(biāo)準(zhǔn)問題 |
點評
我覺得大鋼廠也不一定沒有這種情況,關(guān)鍵是不能確定由于圓度誤差引起的應(yīng)力集中有多大,會不會在設(shè)計扭矩下就變形了
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