1227| 8
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這個題目應(yīng)該改變一下問法: NPT牙的牙頂是做成尖的? 還是平頂?shù)???? |
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小黑屋|手機版|Archiver|機械社區(qū) ( 京ICP備10217105號-1,,京ICP證050210號,,浙公網(wǎng)安備33038202004372號 )
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