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手冊(cè)有問(wèn)題:沉頭孔尺寸與沉頭螺釘?shù)某叽缬谐鋈?/span> |
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點(diǎn)評(píng)
一般內(nèi)六角沉頭(平頭)螺釘頭徑不會(huì)超過(guò)2倍公稱直徑,。
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