3705| 4
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培訓(xùn)時(shí),,講到了一個(gè)加強(qiáng)筋強(qiáng)度公式,,求出處 |
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點(diǎn)評(píng)
確定,?
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點(diǎn)評(píng)
慣性矩I跟寬度成正比,厚度成三次方的關(guān)系,,你百度一下就有了
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點(diǎn)評(píng)
慣性矩I跟寬度成正比,,厚度成三次方的關(guān)系,你百度一下就有了
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