2681| 27
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圓柱齒輪最少可以有幾個齒? |
評分
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點評
現(xiàn)在教培收費真不便宜,一次課要幾大百。這個比搞農(nóng)機掙錢。
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Archiver|手機版|小黑屋|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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