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粗牙螺紋和細(xì)牙哪個強(qiáng)度更高,? |
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點(diǎn)評
也有可能是粗牙的截面小,,所以就容易拉斷,,莫非書里說的細(xì)牙強(qiáng)度高意思就是螺柱的強(qiáng)度更高?就螺紋牙來說可能得具體計算了
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