2445| 8
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計(jì)算圓鋼的抗彎強(qiáng)度 |
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點(diǎn)評(píng)
水泥電線桿做成空心的原因是芯部材料應(yīng)力很低,,最中心的不出力,。講課老師說(shuō)好多單位都是這樣,很多人幾乎不出力,。
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