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在天花板上垂直吊重物 |
點(diǎn)評(píng)
看來沒擰緊
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點(diǎn)評(píng)
靜摩擦系數(shù)按0.1,,那也要論噸了
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點(diǎn)評(píng)
這段敘說有問題。請(qǐng)把M6的鐵膨脹發(fā)個(gè)圖來
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