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蝸輪替代材料,銅價高的驚人---[請教] |
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點評
現在不是研制出很多比ZA27更優秀的鋅基合金了么。
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Archiver|手機版|小黑屋|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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