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我想讓鋼管蓋和鋼管接觸部分密封 防止氣體從螺紋孔漏出 怎么辦 外行 ... |
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小黑屋|手機版|Archiver|機械社區 ( 京ICP備10217105號-1,京ICP證050210號,浙公網安備33038202004372號 )
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