5215| 12
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請(qǐng)幫忙看一下這種雙頭高強(qiáng)螺栓需要潤滑和密封嗎,? |
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點(diǎn)評(píng)
清洗為了減小摩擦阻力,有利于將更多扭矩轉(zhuǎn)化為預(yù)緊力
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